each of the following three data sets represents the iq scores of a random sample of adults. iq scores are known to have a mean and median of 100.

Answers

Answer 1

a) The mean of the sample of size 5 is equals to 103.

b) The mean of the sample of size 12 is equals to 103.3.

c) Median of sample of size 5 is 104.

d) Median sample of size 30 is 105.5.

Mean: Sum of observations is divided by number of observations in the sample is named as mean, which is denoted by X- bar. Moreover, the sample mean signifies the measure of centre of the data.

X-bar = (x₁ + x₂ + --- + xₙ)/n

Median: Median divides the observations into two equal parts. It represents the middle value for a set of observations when they are arranged in order of magnitude. There are two cases arises.

Case (1): Sample size (n) is odd: First, arrange the data in ascending order. Then, the median is the middle value and lies at the position.

Case (2): Sample size (n) is even: First, arrange the data in ascending order. Then, the median is the mean of the two data values that lie on either side of the position. Median = ( n/2)ᵗʰ term , n is odd

=[(( n/2)ᵗʰ term + (n/2 + 1)ᵗʰ term]/2, n is even

Now, a) Mean of first sample with sample size, n = 5.

Sum of values = 105 + 111 + 97 + 94 + 108 = 515

So, mean = 515/5 = 103

b) Sample 2, sample size , n = 12

Sum of values = 105 + 111 + 97 + 94 + 108 + 101 + 112 + 114 + 103+ 102+ 91 + 101

= 515 + 724 = 1239

Mean = 1239/12 = 103.25

c) Now, we have to determine median for sample size 5. Here, sample values are odd in number, i.e., 5. So, middle term is median after arranging in order. Ascending order is 94,97, 104, 108, 111 and middle term is 104, so median is 104.

d) Now, we have a sample of size 30, which is an even number. First arrange the numbers in ascending order as 91,92,92,94,95,97,100,101,101,101,101,102,103,105,105,105,106,107,107,108,110,111, 111, 112,113,114,115,115,116,116. So,

Median is [((n/2)th + (n/2 + 1)th ]/2 i.e, [ 30/2)th + 30/2 + 1)th ]/2

=( 15th + 16th)/2 ( observations)

= (105 + 106 )/2 = 211/2 = 105.5

Hence, the median of sample size 30 is 105.5.

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Complete question:

See the above figure, each of the following three data sets represents the iq scores of a random sample of adults. iq scores are known to have a mean and median of 100.

a) What is the mean of the sample of size 5? Full data set Sample of Size 108 114 (Type an integer or decimal rounded to one decimal place as needed._ Sample of Size 12

b) What is the mean of the sample of size 12? 114 105 115 (Type an integer or decimal rounded to one decimal place as needed:)

c) What is the median of the sample of size 5? (Type an integer or decimal rounded to one decimal place as needed:)

d) What is the median of the sample of size 30? (Type an integer or decimal rounded to one decimal place as needed:)

Each Of The Following Three Data Sets Represents The Iq Scores Of A Random Sample Of Adults. Iq Scores

Related Questions

Drag all of the division problems that have an estimated quotient of 12 into the box.

Answers

A division problem that have an estimated quotient of 12 is: C. 47.6 ÷ 3.9.

What is a quotient?

In Mathematics, a quotient can be defined as a mathematical expression that is typically used for the representation of the division of a number by another number.

This ultimately implies that, a quotient in terms of numerical data simply refers to a division of a number (numerator) by another number (denominator).

Quotient = 8 ÷ 0.95 = 8.42

Quotient = 18 ÷ 2.2 = 8.18.

Quotient = 47.6 ÷ 3.9 = 12.21 ≈ 12.0.

Quotient = 10.6 ÷ 1.89 = 5.61.

Quotient = 71.9 ÷ 6.5 = 11.06.

Quotient = 123.4 ÷ 9.2 = 13.41.

Quotient = 157.4 ÷ 16.4 = 9.60.

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Calculate the absolute standard deviation and the coefficient of variation for the results of the following calculations. Round each result to include only significant figures. The numbers in parentheses are absolute standard deviations. *(a)y=log[2.00(±0.03)×10−4](b)y=log[4.42(±0.01)×1037]*(c)y=antilog[1.200(±0.003)](d)y=antilog[49.54(±0.04)]

Answers

To multiply 64 × 8.32 use the logarithm equation 2)㏒64 + ㏒8.32 and y=log[2.00(±0.03)×10−4] and hence option a is correct

To answer the question, we need to know what logarithm of a number is

What is the logarithm of a number?

The logarithm of a number x is the power to base 10 of that number.

So, logarithm of x to base 10 is written as ㏒x.

Since we want to multiply 64 × 83.2, we convert this to logarithmic equation using the addition rule of logarithm.

Addition rule of logarithm

㏒ab = ㏒a + ㏒b

So, 64 × 8.32 to logarithm is ㏒(64 × 8.32) = ㏒64 + ㏒8.32

So, to multiply 64 × 8.32 use the logarithm equation 2)㏒64 + ㏒8.32

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Which of the following tables represents a linear relationship that is also proportional? x −3 0 3 y 0 2 4 x −4 −2 0 y −2 0 2 x −4 0 4 y 1 0 −1 x −1 0 1 y −5 −3 −1

Answers

A linear relationship represents by the table that is also proportional is x -4 -2 0 y -2 0 2.

What is linear relationship?

A straight-line link between two variables is referred to statistically as a linear relationship (or linear association). Both a graphical representation of a linear relationship, in which the variable and constant are connected by a straight line, and a mathematical representation, in which the dependent variable is determined by multiplying the independent variable by the slope coefficient and a constant.

In given tables

(i) x -3 0 3

   y  0 2 4

These are not in linear relationship nor in proportional because there is no relation between the value of x and y.

(ii) x -4 -2 0

    y -2  0 2

These are in linear relationship and also in proportional because there is a relation between the value of x and y and the relation is y = x + 2.

(iii) x -4 0  4

     y  1  0 -1

These are not in linear relationship nor in proportional because there is no relation between the value of x and y.

(iv) x -1   0  1

     y -5 -3 -1

These are not in linear relationship nor in proportional because there is no relation between the value of x and y.

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Find the exact values of the sine, cosine, and tangent of the angle.

11

Answers

The exact values of the sine, cosine and tangent of 11 is 0.1908, 0.9816 and 0.1944 respectively.

What are Trigonometric Functions?

Trigonometric functions are defined as the real functions which are simply the functions of an angle of a triangle. They are basically the periodic functions which relate an angle in a right angled triangle to the ratios of the length of two sides.

11 degrees can be represented in radians as 0.192

Sine of the angle 11 is,

sin (0.192) = 0.1908

Cosine of the angle 11 is,

cos (0.192) = 0.9816

Tangent of the angle 11 is,

tan (0.192) = 0.1908 / 0.9816 = 0.1944

Hence the trigonometric functions of 11 are sin (0.192) = 0.1908, cos (0.192) = 0.9816 and tan (0.192) = 0.1944.

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FizzBuzz and the Law of De Morgan In this setting, the universal set is the set of natural numbers from 1 to 32 {1, 2, 3, 4, ..., 32} Let T be the subset of numbers that are divisible by 3 and let F be the subset of numbers that are divisible by 5. (a) Write out the elements of each of the following sets: F, T, FC, TC (b) We will do a "proof by example" of De Morgan's Law i. Compute (FUT) ii. Compute FNT iii. Make an observation about the previous two calculations.

Answers

On solving the provided question we can say that - s and t be function subsets of a. show that x ∈  f(S) V f(T) ∈  f(y) as f(y) = x => x∈f(S)∨x∈f(T)

What is function?

One kind of rule is a function, which gives an output in exchange for an input. Alex Federspiel is the photo's source. In this instance, y=x2. I receive the output from something I placed in x in y. We may say that y is a function of x since x serves as the input value. A relation between a collection of inputs, each with an output, is referred to as a function. A function is a connection between inputs that each have precisely one output, to put it simply.

let S contains all elements that are the image of an element in f(s)

and let T  contains all elements that are the image of an element inf(T)

f(y) ∈ f(s) V f(y)

x ∈  f(S) V f(T) ∈  f(y)

as f(y) = x

x ∈ f(S)   ∨    x  ∈  f(T)

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How many line segments are determined by joining the dots on the last two circles?

Answers

The number of line segments that are determined by joining the dots on the last two circles is 20.

What is a line segment?

A line segment is a piece of a line that is connected to two points or has two points on either end. A line segment in geometry is a section of a straight line that is enclosed by two clearly defined end points and contains all of the points on the line that lie inside those endpoints.

The Euclidean distance between two ends of a line segment determines its length. A line segment's length can be calculated using either metric measurements like millimeters or centimeters, or conventional measurements like feet or inches. In this case, the number is 20.

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calculate the average (as a double) of the values contained in the integer variables num1, num2, num3 and assign that average to the double variable avg.

Answers

double average = (double)(num1 + num2 + num3) / 3;

1. Declare and assign a double variable named avg

double avg;

2. Calculate the average of the variables num1, num2, num3 and assign that value to avg

avg = (double)(num1 + num2 + num3) / 3;

double avg;  Declare and assign a double variable named avg

int num1, num2, num3;  Declare three int variables

Assign values to the three int variables

num1 = 10;

num2 = 20;

num3 = 30;

Calculate the average of the three int variables and assign that value to the double variable avg

avg = (double)(num1 + num2 + num3) / 3;  Typecast the result of the addition to a double to get the accurate value

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A model airplane is built with a wing span of 18 inches. The actual wing span of the airplane is 90 feet. Find the scale.

Answers

The scale of the model airplane is 5 feet : 1 inch

How to determine the scale of the model

The scale of the model airplane can be found by dividing the actual wing span by the model wing span

So, we have the following representation

Scale = 90 feet/18 inches

Evaluate the quotient

So, we have the following representation

Scale = 5 feet/inches

Express as ratio

Scale = 5 feet : 1 inch

So, the scale of the model airplane is 5 feet : 1 inch

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A new social media site is increasing its user base by 3% per month. If the site currently has 37,490 users, how many users will there be in 8 months from now?

Answers

The number of users after 8 months is 47612.

What is an equation?

An equation is a mathematical statement that is made up of two expressions connected by an equal sign.

Example:

2x + 4 = 7 is an equation.

We have,

Percentage increase per month = 3%

Number of current users = 37,490

The equation for the number of users after x months.

y = 37,490 x [tex]1.03^x[/tex]

Now,

The number of users after 8 months.

= 37,490 x [tex]1.03^x[/tex]

= 37,490 x [tex]1.03^8[/tex]

= 37,490 x 1.27

= 47612.3

= 47612

Thus,

There will be 47612 users after 8 months.

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34,02 - (-38,3)=
what is the anwer?​

Answers

Answer: 72.32Step-by-step explanation:

to subtract a negative number from a positive is no different than adding 2 positives together.
The way i remember this is by looking at "-(-" and kind of squinting. If you squint hard enough, it kind of looks like a distorted +.
To solve this, just add them as if they were too positives.

Following example 1, to find the area of an isosceles triangle with height 4 cm and width 8 cm, we could use horizontal slices:
a slice at height ℎ has width =
so that we may find the area by integratingDu(answer) ????ℎdh, with
a=
????=

Answers

The area of the triangle is 32 [tex]cm^2.[/tex]We can use horizontal slices to find the area of any two-dimensional shape.

We can use horizontal slices to find the area of the isosceles triangle with height 4 cm and width 8 cm. We set a slice at height h and determine the width of the slice, which is 8 cm. We then integrate the area of the slice (width x height) with respect to h, from 0 to 4 cm. This gives us the area of the triangle, which is 32[tex]cm^2[/tex].

We can use horizontal slices to find the area of any two-dimensional shape. We set a slice at a given height h, and determine the width of the slice. We then integrate the area of the slice (width x height) with respect to h, from the lower boundary of the shape to the upper boundary. This gives us the area of the shape. For example, to determine the area of an isosceles triangle with height 4 cm and width 8 cm, we would set a slice at height h and determine the width of the slice, which is 8 cm. We then integrate the area of the slice (width x height) with respect to h, from 0 to 4 cm. This gives us the area of the triangle, which is 32 [tex]cm^2.[/tex]

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janet and her parents are going to visit scotsbury college, which is 420 miles from where they live. they plan to drive for 4.5 hours on the first day, then stop at a hotel for the night and complete the trip on the second day. they expect their average speed will be 60 miles per hour.

Answers

The equation to be used by Janet to predict number of hours is 60 (h + 4.5) = 420.

Firstly let us form the expression and then match with the provided options. So, the distance covered on first day and the distance covered on second day will be the sum of overall distance between original and target location. Now, we know, speed, distance and time are related to each other as -

speed = distance / time

So, distance covered on first day = 4.5 × 60

Distance covered on second day = 60 × h

Now, overall equation will form is -

60 × h + 4.5 × 60 = 420

Taking 60 common on Left Hand Side of the equation

60 (h + 4.5) = 420

We see the equation is same as fourth option, and hence, it is the correct answer.

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Incomplete steps in the construction of a circumscribed circle are shown. Drag the correct words to each box to complete the steps Drag and drop an answer choice into each empty box below. sides angles
incenter
vertices
circumcenter
angle bisectors perpendicular bisectors Step 1: Create ___ of the triangles. Step 2: They will intersect at the ___ Step : Draw a circle with the center at the point obtained in step ___ and touching the ___ of the triangle.

Answers

Construction of a circumscribed circle mainly includes three steps.

A circumscribed circle is a circle that passes through all the vertices of a polygon. The center of the circumscribed circle is equidistant from all the vertices of the polygon, making it the largest circle that can be drawn around the polygon.

In order to construct a circumscribed circle for a given polygon, we follow a given set of steps.

Step 1: Create perpendicular bisector of the sides of the triangles.

Step 2: They will intersect at the circumcenter.

Step 3: Draw a circle with the center at the point obtained in step 2 and touching the sides of the triangle.

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Zariah's dash times for her first four races were 14, 13.4, 12.8, and 12.2 . Assuming race times will decrease at the same rate. Write an equation for the arithmetic sequence (Hint: find the first term and the common difference first.)

Answers

An equation for the arithmetic sequence is aₙ=14.6-0.6n.

What is an arithmetic sequence?

An arithmetic sequence is a sequence of numbers where the differences between every two consecutive terms is the same. The general form an arithmetic sequence is aₙ=a+(n-1)d.

Given that, Zariah's dash times for her first four races were 14, 13.4, 12.8, and 12.2.

Here, first term (a)=14 and common difference (d)= 13.4-14= -0.6

Now, aₙ=14+(n-1)×(-0.6)

aₙ=14-0.6n+0.6

aₙ=14.6-0.6n

Therefore, an equation for the arithmetic sequence is aₙ=14.6-0.6n.

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if a right triangle has sides of length a, b and c, and if c is the largest, then it is called the hypotenuse. the length of the hypotenuse can be calculated with this formula: c

Answers

The hypotenuse can be found using the Pythagorean formula, which is c=√a²+b².

What is the hypotenuse?

The longest side of a right-angled triangle, or the side opposite the right angle, is known as the hypotenuse in geometry.

The Pythagorean theorem, which asserts that the square of the length of the hypotenuse equals the sum of the squares of the lengths of the other two sides, can be used to determine the length of the hypotenuse.

In this case, if one of the other sides is 3 (when squared, 9) and the other is 4 (when squared, 16), then the sum of their squares is 25.

The square root of 25, or 5, is the length of the hypotenuse.

With the help of the Pythagorean formula, which is c = √a² + b², we can determine the hypotenuse.

Therefore, the hypotenuse can be found using the Pythagorean formula, which is c=√a²+b².

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Which statement is true?

Answers

Answer: 1/3=4/12 is true

Step-by-step explanation:

the others are false because 6/12 is smaller than 2/3, 8/12 is greater than 2/3 and 1/3 is equal to 4/12 not less than.

If the purchase price for a house is $218,500, what is the monthly payment if you put 3.5% down for a 30-year loan with a fixed rate of 6.5%?(use a dollar sign and round 2 decimal places)

Answers

The monthly payment is $1727.82.

What is a percentage?

The percentage is calculated by dividing the required value by the total value and multiplying by 100.

Example:

Required percentage value = a

total value = b

Percentage = a/b x 100

Example:

50% = 50/100 = 1/2

25% = 25/100 = 1/4

20% = 20/100 = 1/5

10% = 10/100 = 1/10

We have,

Price of the house = $218,500

Down payment = 3.5%

This means,

= 3.5/100 x 218,500

= 7647.5

Now,

Time of loan = 30 years.

This means,

30 years = 30 x 12 = 360 months.

Now,

Rate = 6.5%

This means,

The amount of interest rate for 30 years.

Simple interest.

SI = PRT/100

So,

P = 218,500 - 7647.5 = 210852.5

T = 30

R = 6.5

SI = (210852.5 x 6.5 x 30)/100

SI = 411162.375

Now,

Total amount to pay in 30 years.

= SI + P

= 411162.375 +  210852.5

= 622014.875

Now,

Monthly payment.

= 622014.875 / 360

= $1727.82

Thus,

$1727.82 is the monthly payment.

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Englarge the shape below by scale factor 2 using O as the centre of enlargement

Answers

An image of the resulting geometric shape based on a scale factor of 2 using O as the center of enlargement is shown below.

What is dilation?

In Geometry, dilation is a type of transformation which typically changes the size of a geometric shape, but not its shape. This ultimately implies that, the size of the geometric shape would be increased (enlarged) or decreased (reduced) based on the scale factor applied.

In Mathematics, the following rules are applied to interpret and understand the dilation of a geometric shape:

A geometric shape is enlarged when the scale factor is greater than 1.A geometric shape remains the same when the scale factor is equal to 1.A geometric shape is reduced when the scale factor is less than 1.

In this context, we can logically deduce that the size of this geometric shape would be doubled because the scale factor is greater than 1.

Consider the system of equations. Which is the Best method to use for solving the system? 4x+y=1 2x+y=8

Answers

The best solution is to use the elimination method. The best approach to utilize is the elimination technique while trying to solve a problem 4x+y=1 2x+y=8.

What is the process of elimination?

First-order kinetics of elimination Elimination of a fixed portion of the drug amount existing in the body per unit of time. The fraction of elimination to drug concentration.

4x + y = 1 --------(1)

2x + y = 8---------(2)

subtract (2) from (1)

2x = -7

divide bothside by 2

2x/2 = -7/2

x= -7/2

we can substitute x = -7/2 in any of the equations.

Lets take equation (1)

4x + y = 1

4(-7/2) + y =1

2(-7) + y = 1

-14 + y = 1

y = 1+14

y =15

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In each of the following cases, find an interval that contains approximately 95.44 percent of all the possible sample proportions (a) p=.5, n= 250 (Round your answers to 4 decimal places Do not round any intermediate calculations)

Answers

We can use the normal approximation to the binomial distribution to find the interval that contains approximately 95.44 percent of all the possible sample proportions when p=.5 and n=250.

The mean of the distribution of sample proportions is equal to the population proportion (p), which is 0.5 in this case. The standard deviation of the distribution is given by:

σ = sqrt(p(1-p) / n) = sqrt (0.5 * 0.5 / 250) = sqrt (0.0002) = 0.014

Using a z-score of 1.96 to correspond to a confidence level of 95.44 percent (since the standard normal distribution has a proportion of approximately 0.9544 within 1.96 standard deviations of the mean), we find the lower and upper bounds of the interval:

lower bound = p - zσ = 0.5 - 1.96 * 0.014 = 0.471

upper bound = p + zσ = 0.5 + 1.96 * 0.014 = 0.529

Therefore, the interval that contains approximately 95.44 percent of all the possible sample proportions is (0.471, 0.529).

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Determine the area of each composite figure. Round to the nearest tenth if necessary.

Answers

Answer:

169m^2

Step-by-step explanation:

8m x 8m =64m^2

(the area of square = side length x side length)

15m x 7m= 105m^2

(the area of parallelogram= length x height)

so the are of the figure is: 64m^2 + 105m^2= 169m^2

(4) In 2018, Apple had the largest profit of any company in the United States. They made
$48,351,000,000. One of the largest losses of any company during one year was AOL Time Warner in
2002, which lost $123,160,000,000. Write and evaluate a subtraction expression to find the difference
between Apple's 2019 profits and AOL Time Warner's 2002 losses.
I
I
I
I
1

Answers

The value of the equation is A = - $ 74,80,90,00,000

What is an Equation?

Equations are mathematical statements with two algebraic expressions flanking the equals (=) sign on either side.

It demonstrates the equality of the relationship between the expressions printed on the left and right sides.

Coefficients, variables, operators, constants, terms, expressions, and the equal to sign are some of the components of an equation. The "=" sign and terms on both sides must always be present when writing an equation.

Given data ,

Let the equation be represented as A

Now , the value of A is

The profit of Apple in 2018 P = $ 48,351,000,000

The loss of AOL Time Warner in 2002 L = $ 123,160,000,000

So , the difference between between Apple's 2019 profits and AOL Time Warner's 2002 losses is A

A = P - L

Substituting the values in the equation , we get

A = $ 48,351,000,000 - $ 123,160,000,000

On simplifying the equation , we get

A = - $ 74,80,90,00,000

Hence , the equation is A = - $ 74,80,90,00,000

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Allie planned to spend up to $120 on a gaming mouse and headset. She spent $49.95 on a mouse. Then, she bought a headset that put her over her budget. Let x represent the cost of the headset. Which inequality describes the problem?

Answers

The inequality that describes the problem is,

⇒ x + $49.95 < $120

Where, x represent the cost of the headset.

What is Inequality?

A relation by which we can compare two or more mathematical expression is called an inequality.

We have to given that;

Allie planned to spend up to $120 on a gaming mouse and headset. She spent $49.95 on a mouse.

Let x represent the cost of the headset.

Hence, We can formulate;

The inequality that describes the problem is,

⇒ x + $49.95 < $120

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what is 4x+y=5 i need help

Answers

Answer:

This equation is not complete please

Or it is a simultaneous linear equation

Answer:

[tex]4x + y = 5[/tex]

[tex]4x + y - y = 5 - y[/tex]

[tex]4x = 5 - y[/tex]

[tex] \frac{4x}{4} = \frac{5 - y}{4} [/tex]

[tex]x = \frac{5 - y}{4} [/tex]

Andre and Noah started tracking their savings

Answers

This means that both Andre and Noah will save a total of $40 after his five months. 

Andre's formula y = 5x +15

The intersection point is (5, 40)

Noah's equation

y = 7.5x + 2.5

x = number of weeks

y = savings

Andre's equation

y = 5x + 15

Find two points on each line 

x=0

y=2.5

(0, 2.5)

x=0

y=1.5

(0,1.5)

y=0

x=-15/5=-3

(-3, 0)

draw a line through each point

The intersection point is (5, 40)

This means that both Andre and Noah will save a total of $40 after his five months. 

About Graph

Graph can be interpreted or defined as follows:

Graphics can be interpreted as an image or framework that originates from table data which is then used as a visualization object. Graphs are a collection of data sourced from several tables, then represented or displayed in the form of images, such as tubes, triangles, circles and so on. Graphs can also be defined as a picture of the ebb and flow of data that is depicted by lines or pictures.

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__________: a high school counselor uses a computer to generate 50 random numbers and then picks students whose names correspond to the numbers.

Answers

I think what you are looking for is:

Random Selection Method

using the sample statistics information from spss output, calculate a 95% confidence interval for the mean chromatic contrast of crab spiders on daisies. interpret the result.

Answers

In order to calculate a 95% confidence interval for the mean chromatic contrast of crab spiders on daisies, you would need to have the sample mean and standard deviation of the chromatic contrast data.

Additionally, you would need to know the sample size. With this information, you could use a t-distribution or a normal distribution to calculate the confidence interval. Once the confidence interval is calculated, it can be interpreted as a range of values that you can be 95% confident contains the true population mean chromatic contrast of crab spiders on daisies. The confidence interval takes into account both the variability of the data and the sample size, and gives a range of values that is likely to contain the population mean with a certain degree of confidence.

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the trace of a matrix is the sum of its diagonal elements. a for any two matrices a and b, show that trace (a b) trace a trace b. b for any two matrices a and b for which the products ab and ba are defined, show that trace ab trace ba.

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The trace of any two matricess A, B is tr(AB)=tr(A)+tr(B) and tr(AB)=tr(BA).

a) Let A and B be two matrices with dimensions [tex]$n \times n$[/tex]. Then the trace of a matrix is defined as the sum of its diagonal elements, so the trace of A can be written as [tex]$\text{tr}(A) = \sum\limits_{i=1}^n A[i,i]$[/tex] and the trace of B can be written as [tex]$\text{tr}(B) = \sum\limits_{i=1}^n B[i,i]$[/tex].

The product of matrices A and B is a matrix C with dimensions [tex]$n \times n$[/tex], where [tex]$C[i,j] = \sum\limits_{k=1}^n A[i,k] B[k,j]$[/tex].

The trace of the product of matrices A and B can be written as [tex]$\text{tr}(AB) = \sum\limits_{i=1}^n (AB)[i,i] = \sum\limits_{i=1}^n \sum\limits_{k=1}^n A[i,k] B[k,i] = \sum\limits_{k=1}^n A[k,k] B[k,k]$[/tex].

By the distributive property of multiplication, [tex]$\text{tr}(AB) = \sum\limits_{k=1}^n A[k,k] B[k,k] = (\sum\limits_{k=1}^n A[k,k]) + (\sum\limits_{k=1}^n B[k,k]) = \text{tr}(A) + \text{tr}(B)$[/tex].

So, we have shown that [tex]$\text{tr}(AB) = \text{tr}(A) + \text{tr}(B)$[/tex].

b) Let A and B be two matrices for which the products AB and BA are defined. Then the trace of the product AB can be written as [tex]$\text{tr}(AB) = \sum\limits_{i=1}^n (AB)[i,i]$[/tex]

and the trace of the product BA can be written as

[tex]$\text{tr}(BA) = \sum\limits_{i=1}^n (BA)[i,i]$[/tex].

By definition, the elements of the matrices AB and BA are given by [tex]$(AB)[i,j] = \sum\limits_{k=1}^n A[i,k] B[k,j]$[/tex] and [tex]$(BA)[i,j] = \sum\limits_{k=1}^n B[i,k] A[k,j]$[/tex],

respectively. By switching the order of summation, we have [tex]$\text{tr}(AB) = \sum\limits_{i=1}^n \sum\limits_{k=1}^n A[i,k] B[k,i] = \sum\limits_{k=1}^n \sum\limits_{i=1}^n A[i,k] B[k,i] = \text{tr}(BA)$[/tex].

So, we have shown that [tex]$\text{tr}(AB) = \text{tr}(BA)$[/tex].

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glenn wonders what proportion of the students at his school think that tuition is too high. he interviews an srs of 50 of the 2400 students at his college. thirty-eight of those interviewed think tuition is too high.

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The parameter p is the population proportion, that is the proportion of the population that thinks the tuition is too high.  POPULATION=Students at Glenn's school. (b). The numerical value of that estimates p is [tex]\hat{p}[/tex][tex]=\frac{38}{50} =0.76[/tex].  (c). Yes, the population is more than 10 times as large as the sample size.

(a). He conducts SRS interviews with 50 of his college's 2400 pupils. Of those surveyed, 38 believe that tuition is too costly.

The people under study make up the population.

POPULATION=Students at Glenn's school

The parameter p is the population proportion, that is the proportion of the population that thinks the tuition is too high.

This sample proportion can be used to estimate the true proportion of students in the entire population who think tuition is too high. However, it's important to note that the sample proportion is only an estimate and may not be exactly equal to the true population proportion. The level of precision of this estimate can be quantified using a confidence interval.

(b) The sample proportions is the number of people who think the dorm food is good divided by the sample size:

⇒[tex]\hat{p}=\frac{38}{50} =0.76[/tex]

(c). Yes, the population is larger than the sample size by more than 10 times.

⇒n[tex]\hat{p}[/tex]=38>10

⇒n(1-[tex]\hat{p}[/tex])=12>10 and the sample is a simple random sample.

Therefore, the POPULATION=Students at Glenn's school. The numerical value of that estimates p is [tex]\hat{p}=\frac{38}{50} =0.76[/tex].  Yes, the population is more than 10 times as large as the sample size.

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For the right triangle below, find the measure of the angle. Round to the hundredths. (2 decimal places

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Answer:

please take a picture of the triangle so I can help you.

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