Chapter 11: Q.23 (page 655)
A pharmaceutical company is interested in the relationship between age and presenting symptoms for a common viral infection. A random sample is taken of people with the infection across different age groups.
The given statement is a test of independence.
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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?
Do families and singles have the same distribution of cars? Use a level of significance of . Suppose that randomly selected families and randomly selected singles were asked what type of car they drove: sport, sedan, hatchback, truck, van/SUV. The results are shown in Table Do families and singles have the same distribution of cars? Test at a level of significance of .
The number of births per woman in China is down from in . This fertility rate has been attributed to the law passed in restricting births to one per woman. Suppose that a group of students studied whether or not the standard deviation of births per woman was greater than . They asked women across China the number of births they had had. The results are shown in Table. Does the students’ survey indicate that the standard deviation is greater than ?
Is this a right-tailed, left-tailed, or two-tailed test?
State the null and alternative hypotheses?
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