23 Jan Questions 1 to 20: Select the
Statistics Exam
Questions 1 to 20: Select the best answer to each question. Note that a question and its answers may be split across a page break, so be sure that you have seen the entire question and all the answers before choosing an answer.
1. A study was conducted of the 12-month earnings per share for two categories of airline companies, with the result shown in the chart below. Based on the data, which of the following statements is correct?
Large Airlines
Small Airlines
$4.36 $1.60
6.19 –1.98
–0.42 1.03
3.73 –0.21
0.26 –1.15
6.27 4.19
0.59
1.52
1.97
4.57
0.05
A. The large airlines have a mean earnings per share of 3.40, and the small airlines have a standard deviation of 2.01.
B. The large airlines have a standard deviation of 2.88, and the small airlines have a standard deviation of 4.04.
C. The large airlines have a mean earnings per share of 3.40, and the small airlines have a mean earnings per share of 1.22.
D. The large airlines have a variance of 4.04, and the small airlines have a variance of 8.30.
2. Which of the following involves inferential statistics as opposed to descriptive statistics? A. The city business office reported 35 building permits for new single-family housing units.
B. A class of 50 statistics students earned an average grade of 73.5.
C. The Alcohol, Tobacco and Firearms department reported that Houston had 1,791 registered gun dealers in 1997.
D. A local cable system, using a sample of 500 subscribers, estimates that 40 percent of its subscribers watch a premium channel at least once per day.
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