Chapter 11: Q 57 (page 658)
Both sorts of tests are concerned with data that has been cross-classified.
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You want to buy a specific computer. A sales representative of the manufacturer claims that retail stores sell this computer at an average price of with a very narrow standard deviation of . You find a website that has a price comparison for the same computer at a series of stores as follows: . Can you argue that pricing has a larger standard deviation than claimed by the manufacturer? Use the significance level. As a potential buyer, what would be the practical conclusion from your analysis?
Read the statement and decide whether it is true or false.
The number of degrees of freedom for a test of independence is equal to the sample size minus one.
An ice cream maker performs a nationwide survey about favorite flavors of ice cream in different geographic areas of the U.S. Based on the Table, do the numbers suggest that geographic location is independent of favorite ice cream flavors? Test at the significance level.
Transit Railroads is interested in the relationship between travel distance and the ticket class purchased. A random sample of passengers is taken. Table 11.31 shows the results. The railroad wants to know if a passenger’s choice in ticket class is independent of the distance they must travel.
State the hypothesis:
:
:
The marital status distribution of the U.S. male population, ages and older, is as shown in Table 11.35.
| Martial Status | Percent | Frequency |
| never married | 31.3 | |
| married | 56.1 | |
| widowed | 2.5 | |
| divorced /separated | 10.1 |
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