Chapter 11: Q.63 (page 658)
State the null and alternative hypotheses?
The null hypothesis is .
The alternative hypothesis is .
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Suppose an airline claims that its flights are consistently on time with an average delay of at most minutes. It claims that the average delay is so consistent that the variance is no more than minutes. Doubting the consistency part of the claim, a disgruntled traveler calculates the delays for his next flights. The average delay for those flights is minutes with a standard deviation of minutes.
If an additional test were done on the claim of the average delay, but 45 flights were surveyed, which distribution would you use?
Teachers want to know which night each week their students are doing most of their homework. Most teachers think that students do homework equally throughout the week. Suppose a random sample of 56 students were asked on which night of the week they did the most homework. The results were distributed as in Table 11.8.
From the population of students, do the nights for the highest number of students doing the majority of their homework occur with equal frequencies during a week? What type of hypothesis test should you use?
chi-square test statistic = ________
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?
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.
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