Question 1

What is the s² of the following set of scores? 20, 24, 26, 22, 18, 16, 18

Accepted Answer

The variance is 12.95

Question 2

Variability is a measure of how much each score in a group of scores differs from the what?

Accepted Answer

A)   mode
B)   median
C)   variability
D)   mean D

Question 3

In the formula for computing the variance, what does the letter "n" represent?

Accepted Answer

A)   summation
B)   sample size
C)   mean value of the group
D)   individual scores B

Question 4

When calculating the standard deviation, what must be done in order to obtain an unbiased estimate of the population?

Accepted Answer

A)   subtract 1 from X
B)   subtract 1 from N
C)   subtract 1 from n
D)   add 1 to n

Question 5

What is the formula for the exclusive range?

Accepted Answer

A)   r - n +1
B)   h - l + 1
C)   (h - l) r
D)   h - l

Question 6

If you intend to use a sample as an estimate of a population parameter, which standard deviation is the best to calculate?

Accepted Answer

A)   biased
B)   unbiased
C)   squared deviation
D)   mean deviation

Question 7

Write out the two Excel formulas for computing the standard deviation and the variance.

Accepted Answer

The answer of Write out the two Excel formulas for...

Question 8

What is obtained by squaring the standard deviation?

Accepted Answer

A)   mean deviation
B)   range
C)   variance
D)   squared deviation

Question 9

In the formula for computing the range, what does the letter "h" represent?

Accepted Answer

A)   summation
B)   sample size
C)   lowest score
D)   highest score

Question 10

How would you go about computing the variance for a set of scores?

Accepted Answer

The answer of How would you go about computing the...

Question 11

When subtracting the largest number in a distribution from the smallest, what type of variability is being calculated?

Accepted Answer

A)   outliers
B)   standard deviation
C)   variance
D)   range

Question 12

Explain why the standard deviation is referred to as an unbiased estimate. Why are unbiased estimates important to researchers?

Accepted Answer

The answer of Explain why the standard deviation is referred...

Question 13

What is the range of the following set of scores? 10, 15, 12, 18, 19, 16, 12

Accepted Answer

The answer of What is the range of the following...

Question 14

In the formula for computing the standard deviation, what does the Greek letter "?" represent?

Accepted Answer

A)   summation
B)   sample size
C)   mean value of the group
D)   individual scores

Question 15

What is the formula for the standard deviation?

Accepted Answer

The answer of What is the formula for the standard...

Question 16

What is the most frequently used measure of variability?

Accepted Answer

A)   mean deviation
B)   range
C)   variance
D)   standard deviation

Question 17

What is the s² of the following set of scores? 10, 15, 12, 18, 19, 16, 12

Accepted Answer

The answer of What is the s² of the following...

Question 18

What is the term associated with scores that are at the extreme ends of the distribution?

Accepted Answer

A)   variability
B)   outliers
C)   skew
D)   percentile

Question 19

What will the sum of the deviations from the mean always equal?

Accepted Answer

A)   n - 1
B)   0
C)   1
D)   n + 1

Question 20

The average and which of the following can be used to describe the characteristics of a distribution and show how distributions differ from one another?

Accepted Answer

A)   mode
B)   median
C)   variability
D)   sum

Exam 3: Vive La Différence: Understanding Variability