# MATHEMATICS

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

44. (Points: 1)

If a distribution of raw scores is negatively skewed, transforming the raw scores into z scores will result in a ____ distribution.

1. positively skewed

2. bell-shaped

3. normal

4. negatively skewed

Save Answer

45. (Points: 1)

In the equation, Y = bX + a, a is ____.

1. a variable relating Y to X

2. a constant giving the value of the Y axis intercept

3. a constant giving the value of the slope of the line

4. a variable relating X to Y

Save Answer

46. (Points: 1)

In a perfect relationship, ____.

1. all the points fall on the line

2. some of the points fall on the line

3. the points form an ellipse around the line

4. none of the points fall on the line

Save Answer

47. (Points: 1)

The lowest degree of correlation shown below is ____.

1. -0.25

2. -0.33

3. 0.15

4. 0.75

Save Answer

48. (Points: 1)

Rho is used ____.

1. when both variables are dichotomous

2. when one or both variables are only of ordinal scaling

3. when the data is nonlinear

4. when both variables are of interval or ratio scaling

Save Answer

49. (Points: 1)

Exhibit 6-1

A traffic safety officer conducted an experiment to determine whether there is a correlation between people’s ages and driving speeds. Six individuals were randomly sampled and the following data were collected.

Age

20

25

45

46

60

65

Speed (mph)

60

47

55

38

45

35

Refer to Exhibit 6-1. The value of Pearson r equals ____.

1. +0.70

2. -0.70

3. -0.82

4. -0.63

Save Answer

50. (Points: 1)

Exhibit 6-1

A traffic safety officer conducted an experiment to determine whether there is a correlation between people’s ages and driving speeds. Six individuals were randomly sampled and the following data were collected.

Age

20

25

45

46

60

65

Speed (mph)

60

47

55

38

45

35

Refer to Exhibit 6-1. The proportion of variability of Y accounted for by X is ____.

1. -0.49

2. 0.67

3. 0.40

4. 0.49

Save Answer

51. (Points: 1)

The primary reason we use a scatter plot in linear regression is ____.

1. to determine the slope of the least squares regression line

2. to determine if the relationship is linear or curvilinear

3. to compute the magnitude of the relationship

4. to determine the direction of the relationship

Save Answer

52. (Points: 1)

For the following points what would you predict to be the value of Y’ when X = 19? Assume a linear relationship.

X

6

12

30

40

Y

10

14

20

27

1. 17.75

2. 16.35

3. 24.69

4. 22.00

Save Answer