# The most commonly encountered measure of central

Question 1

5 out of 5 points

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

Question 2

5 out of 5 points

is called _________.

Question 3

5 out of 5 points

What is the appropriate symbol for the population standard deviation?

Question 4

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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 5

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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 6

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

Question 7

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 8

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

Question 9

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Given the following set of scores

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

What is the range?

Question 10

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

Question 11

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Given the following set of scores

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

What is the median?

Question 12

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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 13

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Given the following set of scores

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

What is the value of ?

Question 14

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Considering again the information in problem 40, what would be the effect of adding those same new scores on the value of s?

Question 15

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

Question 17

5 out of 5 points

In a negatively skewed distribution, the mean will generally be _______ the median.

Question 18

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Which of the following is (are) not true?

Question 19

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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 20

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