Stats Chapter 4 Mc

Front 1

24. A dot plot shows the A. The general shape of a distribution.B. The mean, median, and mode.C. The relationship between two variables.D. The interquartile range.

Back 1

A. The general shape of a distribution

Front 2

25. A dot plot is best applied when A. The mean, median and mode are equal.B. The general shape of a distribution is symmetric.C. The relationship between two variables is summarized.D. A single variable is summarized.

Back 2

D. A single variable is summarized.

Front 3

26. A dot plot is best applied for a data set with A. 1,000 observations.B. 50 observations.C. More than one variable.D. A one mode.

Back 3

B. 50 observations.

Front 4

27. A dot plot can be used to show A. The mean, median and mode.B. The general shape of a distribution for a nominal qualitative variable.C. The distribution for a quantitative variable.D. The interquartile range.

Back 4

C. The distribution for a quantitative variable.

Front 5

29. A stem-and-leaf display includes the following row: 3 | 0 1 3 5 7 9. Assume that the data is rounded to the nearest whole number. A. The frequency of the class is seven.B. The minimum value in the class is 0.C. The maximum value in the class is 39.D. The class interval is 5.

Back 5

C. The maximum value in the class is 39.

Front 6

31. A stem-and-leaf display includes the following row: 5 | 10 11 31 52 79 98. Assume that the data is rounded to the nearest whole number. A. The frequency of the class is seven.B. The minimum value in the class is 5.C. The maximum value in the class is 98.D. The class interval is 100.

Back 6

D. The class interval is 100.

Front 7

34. The test scores for a class of 147 students are computed. What is the location of the test score associated with the third quartile? A. 111B. 37C. 74D. 75%

Back 7

A. 111

Front 8

35. Quartiles divide a distribution intoA. 2 equal parts.B. 4 equal parts.C. 10 equal parts.D. 100 equal parts.

Back 8

B. 4 equal parts.

Front 9

36. In a distribution, the second quartile corresponds with the A. Mean.B. Median.C. Mode.D. Variance.

Back 9

B. Median.

Front 10

37. Percentiles divide a distribution into A. 2 equal parts.B. 4 equal parts.C. 10 equal parts.D. 100 equal parts.

Back 10

D. 100 equal parts.

Front 11

38. To locate the percentile for a given observation in a data set, the data must be A. Sorted and listed from the minimum to the maximum values.B. Displayed in a histogram.C. Summarized in a cumulative frequency distribution.D. Distributed symmetrically around the mean.

Back 11

A. Sorted and listed from the minimum to the maximum values.

Front 12

39. If a student places in the 99th percentile on an exam, she performed better than 99% of all students who completed the exam. Her performance is similar to a statement based on a A. Frequency table.B. Cumulative frequency distribution.C. Histogram.D. Pie chart.

Back 12

B. Cumulative frequency distribution

Front 13

40. In the following set of data, what are the first, second, and third quartiles?1 3 5 6 7 9 100 A. 1, 6, and 100.B. 3, 5, and 9.C. 3, 6, and 9.D. 1, 5, and 100.

Back 13

C. 3, 6, and 9.

Front 14

42. What statistics are needed to draw a box plot? A. The minimum, maximum, median, first and third quartiles.B. The median, mean and standard deviation.C. The median and interquartile range.D. The mean and standard deviation.

Back 14

A. The minimum, maximum, median, first and third quartiles.

Front 15

43. A box plot shows A. The mean and variance.B. The relative symmetry of a distribution for a set of data.C. The 10th and 90th percentiles of a distribution.D. The deciles of a distribution.

Back 15

B. The relative symmetry of a distribution for a set of data.

Front 16

44. What does the interquartile range describe? A. The lower 50% of the observationsB. The middle 50% of the observationsC. The upper 50% of the observationsD. The lower 25% and the upper 25% of the observations

Back 16

B. The middle 50% of the observations

Front 17

45. The interquartile range is graphically presented in a A. Dot plot.B. Stem-and-leaf display.C. Box plot.D. Contingency table.

Back 17

C. Box plot

Front 18

46. Outliers are clearly presented in a A. Dot plot.B. Stem-and-leaf display.C. Box plot.D. Contingency table.

Back 18

C. Box plot.

Front 19

47. Using the following statistics to describe a distribution of data, what is the interquartile range?Minimum = 10Q1 = 25Median = 50Q3 = 75Maximum = 95 A. 85.B. 50.C. 15.D. 20.

Back 19

B. 50.

Front 20

48. If the coefficient of skewness is equal to zero, the shape of the distribution is A. Negatively skewed.B. Symmetric.C. Positively skewed.D. Unknown.

Back 20

B. Symmetric.

Front 21

49. The coefficient of skewness is A. Always positive or greater than or equal to zero.B. Always negative or less than or equal to zero.C. Positive, negative, or zero.D. Unknown.

Back 21

C. Positive, negative, or zero.

Front 22

51. A large oil company is studying the number of gallons of gasoline purchased per customer at self-service pumps. The mean number of gallons is 10.0 with a standard deviation of 3.0 gallons. The median is 10.75 gallons. What is the Pearson's coefficient of skewness? A. -1.00B. -0.75C. +0.75D. +1.00

Back 22

B. -0.75

Front 23

52. What is the value of the Pearson coefficient of skewness for a distribution with a mean of 17, median of 12 and standard deviation of 6? A. +2.5B. -2.5C. +0.83D. -0.83

Back 23

A. +2.5

Front 24

53. What is the possible range of values for Pearson's coefficient of skewness? A. -1 and +1B. -3 and +3C. 0% and 100%D. Unlimited values

Back 24

B. -3 and +3

Front 25

54. A sample of experienced typists revealed that their mean typing speed is 87 words per minute and the median is 73. The standard deviation is 16.9 words per minute. What is the Pearson's coefficient of skewness? A. -2.5B. -4.2C. +4.2D. +2.5

Back 25

D. +2.5

Front 26

57. In a scatter diagram, we describe the relationship between A. two variables measured at the ordinal level.B. two variables, one measured as an ordinal variable and the other as a ratio variable.C. two variables measured at the interval or ratio level.D. a variable measure on the interval or ratio level and time.

Back 26

C. two variables measured at the interval or ratio level.

Front 27

58. In a contingency table, we describe the relationship between A. two variables measured at the ordinal or nominal level.B. two variables, one measured as an ordinal variable and the other as a ratio variable.C. two variables measured at the interval or ratio level.D. a variable measure on the interval or ratio level and time.

Back 27

A. two variables measured at the ordinal or nominal level.

Front 28

59. A contingency table would be used to summarize data such as A. Company employees by gender and organizational title.B. Company employees by gender and age.C. Company employees by compensation and age.D. Company employees by compensation and years with the company.

Back 28

A. Company employees by gender and organizational title.