# In a bell-shaped distribution

Question 1

5 out of 5 points

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In a bell-shaped distribution, _________.

Question 2

5 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.

Question 3

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 4

5 out of 5 points

The most commonly encountered measure of variability is _________.

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 variance for this distribution is _________. Assume sample data.

Question 6

5 out of 5 points

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

Question 7

5 out of 5 points

Which of the following is (are) not true?

Question 8

0 out of 5 points

Which of the following is not a property of the mean?

Question 9

5 out of 5 points

equals _______ .

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 mode for this distribution is _________.

Question 11

5 out of 5 points

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

Question 12

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 13

5 out of 5 points

Which of the following is not a measure of variability?

Question 14

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 15

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 16

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 17

5 out of 5 points

equals _______ .

Question 18

5 out of 5 points

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

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 median?

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 mean?