# MATHEMATICS

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 range is ____.

1. 12

2. 10

3. 9

4. 2

Save Answer

31. (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 standard deviation is ____. Assume sample data.

1. 2.28

2. 3.34

3. 5.81

4. 3.58

Save Answer

32. (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 variance is ____. Assume sample data.

1. 11.19

2. 33.75

3. 12.79

4. 15.75

Save Answer

33. (Points: 1)

In a bell-shaped distribution, ____.

1. median = mean

2. median < mean

3. median > mean

4. standard deviation equals variance

Save Answer

34. (Points: 1)

The most commonly encountered measure of variability is ____.

1. range

2. mean

3. mode

4. standard deviation

Save Answer

35. (Points: 1)

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

1. equally

2. less

3. can’t say without the scores

4. more

Save Answer

36. (Points: 1)

Exhibit 5-1

A stockbroker has kept a daily record of the value of a particular stock over the years and finds that prices of the stock form a normal distribution with a mean of $8.52 with a standard deviation of $2.38.

Refer to Exhibit 5-1. The percentile rank of a price of $13.87 is ____.

1. 51.22%

2. 98.78%

3. 1.22%

4. 48.78%

Save Answer

37. (Points: 1)

Exhibit 5-1

A stockbroker has kept a daily record of the value of a particular stock over the years and finds that prices of the stock form a normal distribution with a mean of $8.52 with a standard deviation of $2.38.

Refer to Exhibit 5-1. What percentage of the distribution lies between $5 and $11?

1. 49.41%

2. 21.48%

3. 57.98%

4. 78.41%

Save Answer

38. (Points: 1)

Exhibit 5-1

A stockbroker has kept a daily record of the value of a particular stock over the years and finds that prices of the stock form a normal distribution with a mean of $8.52 with a standard deviation of $2.38.

Refer to Exhibit 5-1. What percentage of the distribution lies below $7.42.

1. 31.92%

2. 32.28%

3. 17.72%

4. 82.28%

Save Answer

39. (Points: 1)

Exhibit 5-1

Refer to Exhibit 5-1. The stock price beyond which 0.05 of the distribution falls is ____.

1. $ 4.60

2. $12.47

3. $12.44

4. $ 4.57

Save Answer

40. (Points: 1)

Exhibit 5-1

Refer to Exhibit 5-1. The percentage of scores that lie between $9.00 and $10.00 is ____.

1. 23.24%

2. 15.31%

3. 7.93%

4. 31.17%

Save Answer

41. (Points: 1)

The standard deviation of the z distribution equals ____.

1. 0

2. S X

3. N

4. 1

Save Answer

42. (Points: 1)

The mean of the z distribution equals ____.

1. S X

2. N

3. 0

4. 1

Save Answer

43. (Points: 1)

In a normal distribution approximately ____ of the scores will fall within 1 standard deviation of the mean.

1. 95%

2. 83%

3. 14%

4. 70%

Save Answer