# MATHEMATICS

Exhibit 3-1

A psychologist is interested in the social interactions of preschool children. She measures the number of verbal interactions that each child at a preschool engages in during a day. Here is the frequency distribution of the data.

Refer to Exhibit 3-1. The cumulative frequency for the interval 46-55 is ____.

1. 9
2. 0.29
3. 13
4. 4

19. (Points: 1)

Exhibit 3-1

A psychologist is interested in the social interactions of preschool children. She measures the number of verbal interactions that each child at a preschool engages in during a day. Here is the frequency distribution of the data.

Refer to Exhibit 3-1. The cumulative % for the interval 46-55 is ____.

1. 28.89%
2. 0.64%
3. 20.00%
4. 8.89%

20. (Points: 1)

Exhibit 3-1

A psychologist is interested in the social interactions of preschool children. She measures the number of verbal interactions that each child at a preschool engages in during a day. Here is the frequency distribution of the data.

Refer to Exhibit 3-1. The percentile rank of a score of 40 is ____.

1. 9.67%
2. 16.33%
3. 16.00%
4. 16.67%

21. (Points: 1)

Exhibit 3-1

A psychologist is interested in the social interactions of preschool children. She measures the number of verbal interactions that each child at a preschool engages in during a day. Here is the frequency distribution of the data.

Refer to Exhibit 3-1. The 50th percentile point is ____.

1. 65.00
2. 62.15
3. 65.50
4. 74.00

22. (Points: 1)

Your new Mercedes weighs 1850 kilograms when measured to the nearest kilogram. The real limits of its weight are ____.

1. 1800-1900
2. 1840-1860
3. 1849.5-1850.5
4. 1849-1851

23. (Points: 1)

The range of a set of scores with a maximum value of 92 and a minimum value of 26 is ____.

1. 67
2. 65
3. 92
4. 66

24. (Points: 1)

A distribution which has a predominance of scores at the lower values of the distribution and which tails off at the higher end is ____.

1. symmetrical
2. normally distributed
3. negatively skewed
4. positively skewed

25. (Points: 1)

A curve is negatively skewed when ____.

1. most of the scores occur at the lower end of the horizontal axis and the curve tails off toward the higher end
2. it is folded in half and the two sides do not coincide
3. most of the scores occur at the higher end of the horizontal axis and the curve tails off toward the lower end.
4. there are not enough scores

26. (Points: 1)

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 ____.

1. 83.18
2. 151.28
3. 86.44
4. 47.52

27. (Points: 1)

Exhibit 4-1

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

Refer to Exhibit 4-1. The mode for this distribution is ____.

1. 8
2. 3
3. there is no mode
4. 2

28. (Points: 1)

Exhibit 4-1

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

Refer to Exhibit 4-1. The median is ____.

1. 2.00
2. 3.50
3. 3.25
4. 3.00

29. (Points: 1)

Exhibit 4-1

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

Refer to Exhibit 4-1. The mean is ____.

1. 4.75
2. 4.15
3. 5.43
4. 3.52