# An industrial psychologist observed 8 drill-press operators

Question 1

5 out of 5 points

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An industrial psychologist observed 8 drill-press operators for one working day. She recorded the

number of times each operator pressed the “faster” button instead of the “stop” button to

determine whether the design of the control panel was contributing to the high rate of accidents in

the plant. The resulting scores were as follows:

5, 2, 8, 2, 3, 2, 4, 12

The range for this distribution is _________.

Question 2

5 out of 5 points

If a constant of 5 is subtracted from all of the scores, the standard deviation _________.

Question 3

5 out of 5 points

Given the following set of scores

X: 10, 12, 6, 8, 9, 11, 13, 13, 5, 0, 1

What is the value of ?

Question 4

5 out of 5 points

is called _________.

Question 5

5 out of 5 points

If the distribution is symmetrical, which is the best measure of central tendency?

Question 6

5 out of 5 points

Consider a distribution with N = 100, = 50, and = 9875. If 10 new scores of 50 were added to the distribution, what would happen to the sum of squares?

Question 7

5 out of 5 points

In calculating the standard deviation of a sample, we use _________ in the denominator.

Question 8

5 out of 5 points

Given the following set of scores

X: 10, 12, 6, 8, 9, 11, 13, 13, 5, 0, 1

What is the variance?

Question 9

0 out of 5 points

What is the appropriate symbol for the population standard deviation?

Question 10

0 out of 5 points

equals _______ .

Question 11

5 out of 5 points

The most commonly encountered measure of central tendency is the _________.

Question 12

5 out of 5 points

A distribution has a mean of 78 and a median of 92. This distribution is _________.

Question 13

5 out of 5 points

Assume one has a set of 35 scores with = 100 and s = 9. If 5 scores, each equal to 100 were added to the distribution, what effect would this have on ?

Question 14

0 out of 5 points

The mean weight for team A with 15 members is 140 lbs., the mean weight for team B with 7 members is 135 lbs., and the mean weight for team C with 20 members is 160 lbs. The overall mean weight for all three teams is _________.

Question 15

5 out of 5 points

A history professor gives a quiz to his class and records the following scores:

13, 11, 11, 9, 12, 13, 16, 14, 11, 10, 8, 13, 20.

The mean for this distribution is _________.

Question 16

0 out of 5 points

In a bell-shaped distribution, _________.

Question 17

5 out of 5 points

An industrial psychologist observed 8 drill-press operators for one working day. She recorded the number of times each operator pressed the “faster” button instead of the “stop” button to determine whether the design of the control panel was contributing to the high rate of accidents in the plant. The resulting scores were as follows:

5, 2, 8, 2, 3, 2, 4, 12

The variance for this distribution is _________. Assume sample data.

Question 18

5 out of 5 points

A history professor gives a quiz to his class and records the following scores:

13, 11, 11, 9, 12, 13, 16, 14, 11, 10, 8, 13, 20.

The standard deviation for this distribution is _________. Assume sample scores.

Question 19

5 out of 5 points

Given the following set of scores

X: 10, 12, 6, 8, 9, 11, 13, 13, 5, 0, 1

What is the mode?

Question 20

5 out of 5 points

The mean is _______ sensitive to extreme scores than the median.