Deck 4: Measures of Variability

Question 1

The question below refers to the following situation:
A university's administration is interested in understanding students'study habits. The School randomly surveys 13 students and asks them how much time per weeknight they Typically spend studying. The following are the responses in minutes:
60, 90, 120, 120, 150, 180, 180, 180, 180, 210, 240, 270, 300
Calculate the standard deviation.

A)12.18
B)240
C)66.40
D)34 ,085

Answer 1

66.40

Question 2

The range is useful for:

A)advanced statistical procedures.
B)estimating the standard deviation.
C)computing the median.
D)all of the above

Answer 2

estimating the standard deviation.

Question 3

Standard deviation can only be used for variables measured at which level?

A)ordinal level
B)nominal level
C)interval level
D)all of the above

Answer 3

interval level

Question 4

The standard deviation measures the degree of variability in a distribution.

Question 5

The question below refers to the following situation:
A university's administration is interested in understanding students' study habits. The School randomly surveys 13 students and asks them how much time per weeknight they Typically spend studying. The following are the responses in minutes:
60, 90, 120, 120, 150, 180, 180, 180, 180, 210, 240, 270, 300
What is the mode?

A)120
B)180
C)4
D)none of the above

Question 6

Given the following distribution of quiz scores for a statistics course:
87, 91, 74, 73, 80, 84, 68, 75
What is the variance?

A)54
B)7.35
C)48
D)43 2

Question 7

A synonym for variability is:

A)width.
B)summary.
C)average.
D)none of the above

Question 8

Another synonym for variability is:

A)dispersion.
B)length.
C)mean.
D)di splay.

Question 9

For a somewhat normal distribution, the range is approximately equal to how many times
The standard deviation?

A)2
B)4
C)6
D)8

Question 10

The difference between the highest and the lowest values in a distribution of scores is known
As the:

A)deviation.
B)midpoint.
C)range.
D)m edian.

Question 11

The mean of the squared deviations is better known as:

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

Question 12

Given the following distribution of quiz scores for a statistics course:
87, 91, 74, 73, 80, 84, 68, 75
What is the standard deviation?

A)2.71
B)2.60
C)6.11
D)7.35

Question 13

The standard deviation is a measure of __________.

A)central tendency
B)variability
C)accuracy
D)b and c

Question 14

The question below refers to the following situation:
A university's administration is interested in understanding students' study habits. The School randomly surveys 13 students and asks them how much time per weeknight they Typically spend studying. The following are the responses in minutes:
60, 90, 120, 120, 150, 180, 180, 180, 180, 210, 240, 270, 300
Calculate the range.

A)240
B)300
C)9
D)4

Question 15

The question below refers to the following situation:
A university's administration is interested in understanding students' study habits. The School randomly surveys 13 students and asks them how much time per weeknight they Typically spend studying. The following are the responses in minutes:
60, 90, 120, 120, 150, 180, 180, 180, 180, 210, 240, 270, 300
What is the median?

A)180
B)175.38
C)45
D)13

Question 16

Which of the following is a measure of variability?

A)the mode
B)the standard deviation
C)the median
D)none of the above

Question 17

The preceding raw-score formula defines:

A)the variance.
B)the mean deviation.
C)the standard deviation.
D)none of the above

Question 18

The question below refers to the following situation:
A university's administration is interested in understanding students' study habits. The School randomly surveys 13 students and asks them how much time per weeknight they Typically spend studying. The following are the responses in minutes:
60, 90, 120, 120, 150, 180, 180, 180, 180, 210, 240, 270, 300
Calculate the mean.

A)228
B)157.83
C)175.38
D)18 0

Question 19

The question below refers to the following situation:
A university's administration is interested in understanding students' study habits. The School randomly surveys 13 students and asks them how much time per weeknight they Typically spend studying. The following are the responses in minutes:
60, 90, 120, 120, 150, 180, 180, 180, 180, 210, 240, 270, 300
Calculate the variance.

A)292.62
B)148.26
C)360
D)44 09.47

Question 20

Given the following distribution of quiz scores for a statistics course:
87, 91, 74, 73, 80, 84, 68, 75
What is the range?

A)21
B)23
C)25
D)30

Question 21

The question below refers to the following situation:
Below are two distributions of final scores for separate statistics courses. The first is from the Fall term, the second is from the Spring term.
The variance for the Spring is __________.

Question 22

A normal (symmetrical) distribution has no variability.

Question 23

Dispersion is synonymous with variability.

Question 24

Scores that have a small standard deviation are relatively inconsistent.

Question 25

The standard deviation is a more precise measure of variation than the range.

Question 26

The question below refers to the following situation:
Below are two distributions of final scores for separate statistics courses. The first is from the Fall term, the second is from the Spring term.
The mean for the Fall is __________.

Question 27

The question below refers to the following situation:
Below are two distributions of final scores for separate statistics courses. The first is from the Fall term, the second is from the Spring term.
The variance for the Fall is __________.

Question 28

The question below refers to the following situation:
Below are two distributions of final scores for separate statistics courses. The first is from the Fall term, the second is from the Spring term.
The standard deviation for the Fall is __________.

Question 29

The question below refers to the following situation:
Below are two distributions of final scores for separate statistics courses. The first is from the Fall term, the second is from the Spring term.
The range for the Spring is __________.

Question 30

The question below refers to the following situation:
Below are two distributions of final scores for separate statistics courses. The first is from the Fall term, the second is from the Spring term.
What do the different standard deviations between the Fall and Spring statistics courses indicate?

Question 31

The question below refers to the following situation:
Below are two distributions of final scores for separate statistics courses. The first is from the Fall term, the second is from the Spring term.
The standard deviation for the Spring is __________.

Question 32

The following distribution represents 8 quiz scores: {100, 98, 98, 96, 95, 90, 86, 78}. Please calculate the range.

Question 33

The question below refers to the following situation:
Below are two distributions of final scores for separate statistics courses. The first is from the Fall term, the second is from the Spring term.
As this example illustrates, a disadvantage of the range is that it is __________ than the
standard deviation.

Question 34

The higher the standard deviation, the greater the variation.

Question 35

Find the standard deviation for the following frequency distribution of the hours spent at a youth recreation center on a Saturday night by a sample of 20 teenagers:

Question 36

The question below refers to the following situation:
Below are two distributions of final scores for separate statistics courses. The first is from the Fall term, the second is from the Spring term.
The mean for the Spring is __________.

Question 37

The range and standard deviation are always identical.

Question 38

The question below refers to the following situation:
Below are two distributions of final scores for separate statistics courses. The first is from the Fall term, the second is from the Spring term.
The range for the Fall is __________.