Question 1

The interquartile range tells you something aboutof the scores of the distribution.

Accepted Answer

A)  one-tenth 
B)  one-fourth 
C)  one-half 
D)  nine-tenths.

Question 2

Calculating a deviation score requires the interquartile range.

Accepted Answer

A) True 
 B)False

Question 3

A squared standard deviation is called a variance.

Accepted Answer

A) True 
 B)False

Question 4

The text uses a pie chart to show a mean and standard deviation on a single graph.

Accepted Answer

A) True 
 B)False

Question 5

A negative number is possible when you calculate

Accepted Answer

A)  the range 
B)  the interquartile range 
C)  the variance 
D)  a deviation score.

Question 6

Write a paragraph on the standard deviation. Include what it measures, how it is related to the range, and the difference between the standard deviation of a population, that of a sample, and that of a sample estimating a parameter.

Accepted Answer

The answer of Write a paragraph on the standard deviation....

Question 7

Three different standard deviation formulas re used to indicate variability about the mean, median, and mode, respectively.

Accepted Answer

A) True 
 B)False

Question 8

An error is indicated if a standard deviation is equal to a negative number.

Accepted Answer

A) True 
 B)False

Question 9

Data Set 4-5: 2, 4, 6, 8
-Which of the following distributions is more variable than Data Set 4-5? (You should be able to answer just by eyeballing the numbers.)

Accepted Answer

A)  3, 5, 7, 9 
B)  -2, 0, 2, 4 
C)  10, 11, 12, 13 
D)  none of the above

Question 10

Which of the following statements is false, according to your text?

Accepted Answer

A)  The salaries of people in sales are more variable than those in management. 
B)  For a distribution of scores, $\hat { S }$ is smaller than S. 
C)  Males are more variable than females in reaching puberty. 
D)  none of the other alternatives are correct.

Question 11

For a sample of 100 or fewer the standard deviation could be aboutthe range. (Careful on this one.)

Accepted Answer

A)  2 times 
B)  5 times 
C)  2-5 times 
D)  one-fourth.

Question 12

An error is indicated if the sum of the deviation scores for a distribution is a negative number.

Accepted Answer

A) True 
 B)False

Question 13

Data Set 4-1: 2, 7, 3, 6, 2
-For Data Set 4-1, the population variance is

Accepted Answer

A)  2.05 
B)  4.20 
C)  4.40 
D)  22.

Question 14

Calculating a deviation score requires a mean.

Accepted Answer

A) True 
 B)False

Question 15

Data Set 4-3: -2, -1, 0, 2, 6
-Which of the following distributions is more variable than Data Set 4-3? (You should be able to answer by just eyeballing the numbers.)

Accepted Answer

A)  2, 1, 0, 1, 2, 6 
B)  0, 1, 2, 3, 4, 6 
C)  -1, -1, 0, 1, 1 
D)  none of the other alternatives are correct

Question 16

The text uses a bar graph and error bars to show a mean and standard deviation on a single graph.

Accepted Answer

A) True 
 B)False

Question 17

The following hypothetical data were obtained from a random sample of freshmen. They represent attitude scores toward the statement "Handguns should be registered."The investigator was interested in the variability of attitudes among freshmen on this question.3 , 6 , 5 , 5 , 7 , 4 , 2 , 6 , 5 , 7
a. Arrange these data into an appropriate frequency distribution.
b. Calculate the range.
c. Find the standard deviation using the deviation method.

Accepted Answer

The answer of The following hypothetical data were obtained from...

Question 18

Among the legendary ranches in North America such as the Dragging y Cattle Ranch and the CS Cattle Company, some authors include the imaginary Stats Bar-X Ranch. The Stats Bar?X, known for its century-old horse breeding program, is famous for big horses.The measures below, in hands, are a sample of heights on the Bar-X. (A hand is equal to 4 inches.) Find the range and interquartile range. Estimate the standard deviation of the height of all the horses on the Stats Bar-X Ranch. $$\begin{array} { l l l l l l l l } 
16 & 19 & 17 & 16 & 18 & 18 & 15 & 20 \
17 & 18 & 14 & 16 & 17 & 19 & 15 & 17
\end{array}$$

Accepted Answer

The answer of Among the legendary ranches in North America...

Question 19

An error is indicated when the sum of the deviation scores for a distribution is 0.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following statements is concerned with variability?

Accepted Answer

A)  Whatever will be, will be. 
B)  A friend in need is a friend indeed. 
C)  It is not possible to step twice in the same river. 
D)  Haste makes waste.

Exam 4: Exploring Data: Variability

The interquartile range tells you something aboutof the scores of the distribution.

Calculating a deviation score requires the interquartile range.

A squared standard deviation is called a variance.

The text uses a pie chart to show a mean and standard deviation on a single graph.

A negative number is possible when you calculate

Write a paragraph on the standard deviation. Include what it measures, how it is related to the range, and the difference between the standard deviation of a population, that of a sample, and that of a sample estimating a parameter.

Three different standard deviation formulas re used to indicate variability about the mean, median, and mode, respectively.

An error is indicated if a standard deviation is equal to a negative number.

Data Set 4-5: 2, 4, 6, 8 -Which of the following distributions is more variable than Data Set 4-5? (You should be able to answer just by eyeballing the numbers.)

Which of the following statements is false, according to your text?

For a sample of 100 or fewer the standard deviation could be aboutthe range. (Careful on this one.)

An error is indicated if the sum of the deviation scores for a distribution is a negative number.

Data Set 4-1: 2, 7, 3, 6, 2 -For Data Set 4-1, the population variance is

Calculating a deviation score requires a mean.

Data Set 4-3: -2, -1, 0, 2, 6 -Which of the following distributions is more variable than Data Set 4-3? (You should be able to answer by just eyeballing the numbers.)

The text uses a bar graph and error bars to show a mean and standard deviation on a single graph.

An error is indicated when the sum of the deviation scores for a distribution is 0.

Which of the following statements is concerned with variability?