Question 1

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

Accepted Answer

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

Question 2

Which of the following sets of data has no variability?

Accepted Answer

A) 1, 2, 5, 4, 7 
B) 7, 7, 7, 2, 9 
C) 5, 5, 5, 5, 5 
D) 0, 0, 0, 0, 10 
A) 1, 2, 5, 4, 7 
B) 7, 7, 7, 2, 9 
C) 5, 5, 5, 5, 5 
D) 0, 0, 0, 0, 10

Question 3

How does a biased standard deviation differ from an unbiased standard deviation?

Accepted Answer

The biased standard deviation uses n in

Question 4

If you have a lowest score of 21 and a range of 47, your highest score will be _______.

Accepted Answer

A) 26 
B) 21 
C) 47 
D) 68 
A) 26 
B) 21 
C) 47 
D) 68

Question 5

If you subtract the smallest number in the distribution from the largest, what type of variability is being calculated?

Accepted Answer

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

Question 6

What are the three tools used to assess variability?

Accepted Answer

A) range, standard deviation, and variance 
B) mean, median, and mode 
C) variance, range, and mean 
D) mean, standard deviation, and skewness 
A) range, standard deviation, and variance 
B) mean, median, and mode 
C) variance, range, and mean 
D) mean, standard deviation, and skewness

Question 7

Variability is also called dispersion or spread.

Accepted Answer

A) True 
 B)False

Question 8

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

Accepted Answer

A) 7 
B) 8 
C) 9 
D) 10 
A) 7 
B) 8 
C) 9 
D) 10

Question 9

What is the variance for the following set of scores: 10, 15, 12, 18, 19, 16, 12?

Accepted Answer

A) 3.36 
B) 11.29 
C) 6.47 
D) 17.18 
A) 3.36 
B) 11.29 
C) 6.47 
D) 17.18

Question 10

Which of the following sets of scores has the least variability?

Accepted Answer

A) 5, 4, 5, 6, 5 
B) 7, 2, 8, 9, 4 
C) 12, 14, 17, 19, 21 
D) 1, 2, 1, 7, 9 
A) 5, 4, 5, 6, 5 
B) 7, 2, 8, 9, 4 
C) 12, 14, 17, 19, 21 
D) 1, 2, 1, 7, 9

Question 11

A standard deviation equal to 0 indicates no variance in your data.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following measures how different scores are from one particular score?

Accepted Answer

A) average 
B) correlation 
C) variability 
D) standard deviation 
A) average 
B) correlation 
C) variability 
D) standard deviation

Question 13

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

Accepted Answer

A) summation 
B) sample size 
C) mean score for group 
D) individual score 
A) summation 
B) sample size 
C) mean score for group 
D) individual score

Question 14

What is obtained by squaring the standard deviation?

Accepted Answer

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

Question 15

In order to calculate the variance, which of the following must you know?

Accepted Answer

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

Question 16

Variability is a measure of how much individual scores differ from the _______.

Accepted Answer

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

Question 17

The variance is more difficult to interpret than the standard deviation.

Accepted Answer

A) True 
 B)False

Question 18

What are the three measures of variability? Which is the most commonly reported?

Accepted Answer

The three measures of variabil

Question 19

What is the formula for calculating the inclusive range?

Accepted Answer

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

Question 20

Variance is a difficult number to interpret.

Accepted Answer

A) True 
 B)False

Exam 3: Vive La Différence: Understanding Variability

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

Which of the following sets of data has no variability?

How does a biased standard deviation differ from an unbiased standard deviation?

If you have a lowest score of 21 and a range of 47, your highest score will be _______.

If you subtract the smallest number in the distribution from the largest, what type of variability is being calculated?

What are the three tools used to assess variability?

Variability is also called dispersion or spread.

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

What is the variance for the following set of scores: 10, 15, 12, 18, 19, 16, 12?

Which of the following sets of scores has the least variability?

A standard deviation equal to 0 indicates no variance in your data.

Which of the following measures how different scores are from one particular score?

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

What is obtained by squaring the standard deviation?

In order to calculate the variance, which of the following must you know?

Variability is a measure of how much individual scores differ from the _______.

The variance is more difficult to interpret than the standard deviation.

What are the three measures of variability? Which is the most commonly reported?

What is the formula for calculating the inclusive range?

Variance is a difficult number to interpret.

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