Assignment: Measures of Variability

Take Test: Quiz - Week 4

PLEASE ONLY HIGHLIGHT THE CORRECT ANSWER IN RED AND PLEASE RESEACH ALL ANSWERS BEFORE ANSWERING AND DO YOUR BEST WORK ON THESE 10 QUESTIONS THANKS……….

QUESTION 1

Which of the following statements about the mean is false?

A.

The mean and the median sometimes have the same value.

B.

The mean is not used with variables measured at the ordinal level.

C.

The mean is pulled in the direction of the hump in a skewed distribution.

D.

The value of the mean reflects both the number and the value of cases.

QUESTION 2

You must compare the monthly expenditures of prisons sampled from 20 U.S. states. The purpose of the comparison is to identify prisons that are spending exceptionally large amounts over a 2-year period. Which statistic should you use?

A.

Standard deviation

B.

Mean

C.

Median

D.

Mode

QUESTION 3

Seven detention centers are surveyed. The current number of inmates in each detention center is 25, 23, 22, 17, 5, 42, and 105. What is the median number of inmates?

A.

5

B.

17

C.

22

D.

23

QUESTION 4

Which statement about the mode is false?

A.

The value of the mode can be misleading if two categories have almost the same frequency.

B.

The value of the mode can be far from the range of values having the most cases.

C.

There can be multiple modes in a distribution.

D.

The value of the mode is the frequency of the most frequent value.

QUESTION 5

Standard deviation is the:

A.

Square of the average squared deviations of each case from the mean

B.

Square root of the sum of the squared deviations of each case from the mean

C.

Square root of the average squared deviations of each case from the mean

D.

Square root of the average absolute deviation of each case from the mean

QUESTION 6

What will be the relation between the values of the median and the mean in a positively skewed distribution?

A.

The mean will be higher than the median.

B.

The mean will be lower than the median.

C.

The mean and the median will be equal.

D.

There will be no relation between the values of the median and the mean.

QUESTION 7

Which statement about the relation between the mode, median, and mean is generally correct?

A.

There is no relation between their values.

B.

The median and the mean have higher values than the mode.

C.

The mean tends to have a higher value than the median or the mode.

D.

The mean and the median are on opposite sides from the mode in a normal distribution.

QUESTION 8

The variance is the _____________ of the standard deviation.

A.

product

B.

square root

C.

square

D.

denominator

QUESTION 9

A marketing firm is hired to promote two drug rehabilitation centers to attract more business to these centers. The firm decides to do so by emphasizing the experience of the counselors. In Center A, most counselors have 8 or more years of experience, but a few have about 6. Most counselors in Center B have 5 to 6 years of experience, but a few have 9 or more. Which averages should be used to maximize the appeal of each center?

A.

Mean for Center A; median for Center B

B.

Mode for both centers

C.

Median for Center A; mean for Center B

D.

Mean for both centers

QUESTION 10

You enter a prison that has many inmates of varying ages. You must interview one inmate for a research project. This inmate should be just in the middle of the age distribution of the inmates—that is, an inmate who is younger than one half of the other inmates and older than the other half. Which statistic should you use?

A.

Standard deviation

B.

Mean

C.

Median

D.

Mode