# An industrial psychologist observed 8 drill-press operators for

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 mode for this distribution is _________.

Question 2

5 out of 5 points

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

Question 3

5 out of 5 points

In a bell-shaped distribution, _________.

Question 4

0 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 5

0 out of 5 points

Which of the following do (does) not measure average dispersion?

Question 6

0 out of 5 points

equals _______ .

Question 7

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 median for this distribution is _________.

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

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 mode(s) for this distribution is(are) _________.

Question 10

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is called _________.

Question 11

5 out of 5 points

On a physics exam, the instructor gives a bonus question worth 10 points. The class average (mean) without counting the bonus question is 83. If everyone gets the bonus question correct, the class mean would _________.

Question 12

0 out of 5 points

For any distribution of scores S (X – μ) = _________.

Question 13

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 median?

Question 14

5 out of 5 points

The mean number of students in a classroom at school A is 32.5 and there are 25 classrooms. The mean number of students at school B is 29.6 in 12 classrooms. At school C the mean in each class is

15.3 for 10 classrooms. What is the mean number of students per classroom for all the schools combined?

28.1

Question 15

0 out of 5 points

What is the appropriate symbol for the population standard deviation?

Question 16

5 out of 5 points

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

Question 17

5 out of 5 points

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

Question 18

0 out of 5 points

The most commonly encountered measure of variability is _________.

Question 19

5 out of 5 points

If s = 12 for a set of 200 scores and 5 points were subtracted from each of the scores, the new value of the standard deviation would be _________.

Question 20

5 out of 5 points

Which of the following is not a measure of central tendency?