Statistics Tutorial

BSA

Tutorial # 2

1) An annual survey sent to retail store managers contained the question “Did your store suffer any losses due to employee theft?” The responses are summarized in the table for two years, 2000 and 2005. Compare the responses for the two years using bar charts. What inferences can be made from the charts?

Employee

Theft

Percentage

in 2000

Percentage

in 2005

Yes

No

Don’know

Totals 34

51

15

100 23

68

9

100

2) The data show the total number of medals (gold, silver, and bronze) won by each country winning at least one gold medal in the 2006 Winter Olympics.

1 2 3 3 4 9 9 11 11

11 14 14 19 22 23 24 25 29

a. Complete the class frequency table for the data.

Total Medals Frequency

1-5

6-10

11-15

16-20

21-25

26-30

b. Using the classes from the frequency table, construct a histogram for the data.

3) The scores for a statistics test are as follows:

87 76 91 77 92 96 88 85 66 89

79 98 58 99 83 88 82 59 15 69

Create a stem-and-leaf display for the data.

4) A sociologist recently conducted a survey of senior citizens who have net worths too high to qualify for Medicaid but have no private health insurance. The ages of the 25 uninsured senior citizens were as follows:

69 74 67 77 87 75

62 90 66 91 70 93

77 63 82 64 69 82

71 74 61 88 76 65 83

Find the median of the observations.

5) The scores for a statistics test are as follows:

98 76 97 77 99 92 78 85 71 89

79 84 50 60 85 70 85 87 18 75

Compute the mean score.

6) At the U.S. Open Tennis Championship a statistician keeps track of every serve that a player hits during the tournament. The statistician reported that the mean serve speed of a particular player was 103 miles per hour. Suppose that the statistician indicated that the serve speed distribution was...