# In calculating the standard deviation of a sample

Question 1

5 out of 5 points

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

Question 2

5 out of 5 points

Let’s assume that we have determined the salary of all the professors at your school. In plotting the distribution of salaries we notice that it is positively skewed. For this distribution _________.

Question 3

5 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 4

5 out of 5 points

In a bell-shaped distribution, _________.

Question 5

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 median for this distribution is _________.

Question 6

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 7

5 out of 5 points

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

Question 8

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 9

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 10

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 11

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 12

5 out of 5 points

is called _________.

Question 13

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 mean for this distribution is _________.

Question 14

5 out of 5 points

The most commonly encountered measure of variability 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 median for this distribution is _________.

Question 16

5 out of 5 points

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

Question 17

5 out of 5 points

Consider the following scores: 21, 22, 22, 0.1, 20, 25, 28, 26, 23, 19, 0.5. Which of the measures listed below would give the best description of the central tendency of these scores?

Question 18

5 out of 5 points

equals _______ .

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 mean?

Question 20

5 out of 5 points

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