11 May Question1.2 Which of these variables are quantitative and which are
Question
a. The dollar amount on accounts receivable invoice.
b. The net profit for a company in 2009.
c. The stock exchange on which a company’s stock is traded.
d. The national debt of the United States in 2009.
e. The advertising medium (radio, television, or print) used to promote a product.
1.17 Classify each of the following qualitative variables as ordinal or nominative.
Qualitative Variable Categories
Statistics course letter grade A B C D F
Door choice on Let’s Make A Deal Door #1 Door #2
Television show classifications TV-G TV-PG TV-14 TV-MA
Personal computer ownership Yes No
Restaurant rating ***** **** *** ** *
Income tax filing status Married filing jointly Married filing separately
Single Head of household Qualifying widow(er)
3.3 Calculate the mean, median, and mode of each of the following populations of numbers:
a. 9, 8, 10, 10, 12, 6, 11, 10, 12, 8
b. 110, 120, 70, 90, 90, 100, 80, 130, 140
3.22 In order to control costs, a company wishes to study the amount of money its sales force spends entertaining clients. The following is a random sample of six entertainment expenses (dinner cost for four people) from expense report submitted by members of the sales force.
$157 $132 $109 $145 $125 $139
a. Calculatex, s2, and s for the expense data. In addition, show that the two different formulas for calculating s2 give the same result.
b. Assuming that the distribution of entertainment expenses is approximately normally distributed calculate estimates of tolerance intervals containing 68.26 percent, 95.44 percent, and 99.73 percent of all entertainment expenses by the sales force.
c. If a member of the sales force submits an entertainment expense (dinner cost for four) of $190, should this expense be considered unusually high (and possibly worthy of investigation by the company)? Explain your answer.
d. Compute and interpret the z-score for each of the six entertainment expe
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