An industrial psychologist observed 8 drill-press operators for one working

Question 1

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 mode for this distribution is _________.

Question 2

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 3

5 out of 5 points

If 5 points are added to each score in a distribution, which of the following will happen?

Question 4

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 range?

Question 5

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?

Question 6

5 out of 5 points

In a bell-shaped distribution, _________.

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

Question 8

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 9

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 10

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 standard deviation for this distribution is _________. Assume sample data.

Question 11

5 out of 5 points

What is the appropriate symbol for the population standard deviation?

Question 12

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 13

5 out of 5 points

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

Question 14

5 out of 5 points

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

Question 15

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 range for this distribution is _________.

Question 16

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 variance for this distribution is _________. Assume sample scores.

Question 17

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 range for this distribution is _________.

Question 18

0 out of 5 points

If the following scores were population scores

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

What would the standard deviation be?

Question 19

0 out of 5 points

In a certain statistics course, four exams were given. Each student’s grade was based on a weighted average of his exam scores. The first two tests had weights of 1, the third test had a weight of 2, and the final test had a weight of 3. The exam scores for one student are listed below.

The student’s overall average was _________.

Question 20

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?