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
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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
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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
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33. (Points: 1)

In a bell-shaped distribution, ____.

1. median = mean
2. median < mean
3. median > mean
4. standard deviation equals variance
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34. (Points: 1)

The most commonly encountered measure of variability is ____.

1. range
2. mean
3. mode
4. standard deviation
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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
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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%
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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%
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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%
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39. (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 stock price beyond which 0.05 of the distribution falls is ____.

1. $ 4.60
2. $12.47
3. $12.44
4. $ 4.57
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40. (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 percentage of scores that lie between $9.00 and $10.00 is ____.

1. 23.24%
2. 15.31%
3. 7.93%
4. 31.17%
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41. (Points: 1)

The standard deviation of the z distribution equals ____.

1. 0
2. S X
3. N
4. 1
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42. (Points: 1)

The mean of the z distribution equals ____.

1. S X
2. N
3. 0
4. 1
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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%
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