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Chapter 11: Q. 3.2 (page 705)
Interpret the -value from the calculator in context.
The -value using the calculator is .
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Which hypotheses would be appropriate for performing a chi-square test?
(a) The null hypothesis is that the closer students get to graduation, the less likely they are to be opposed to tuition increases. The alternative is that how close students are to graduation makes no difference in their opinion.
(b) The null hypothesis is that the mean number of students who are strongly opposed is the same for each of the four years. The alternative is that the mean is different for at least two of the four years.
(c) The null hypothesis is that the distribution of student opinion about the proposed tuition increase is the same for each of the four years at this university. The alternative is that the distribution is different for at least two of the four years.
(d) The null hypothesis is that year in school and student opinion about the tuition increase in the sample are independent. The alternative is that these variables are dependent.
(e) The null hypothesis is that there is an association between a year in school and opinion about the tuition increase at this university. The alternative hypothesis is that these variables are not associated.
Regulating guns The National Gun Policy Survey asked a random sample of adults, 鈥淒o you think there should be a law that would ban possession of handguns except for the police and other authorized persons?鈥� Here are the responses, broken down by the respondent鈥檚 level of education:
(a) How do opinions about banning handgun ownership seem to be related to the level of education? Make an appropriate graph to display this relationship. Describe what you see.
(b) Determine whether or not the sample provides convincing evidence that education level and opinion about a handgun ban are independent in the adult population
Birds in the trees Researchers studied the behavior of birds that were searching for seeds and insects in an Oregon forest. In this forest, % of the trees were Douglas 铿乺s, % were ponderosa pines, and % were other types of trees. At a randomly selected time during the day, the researchers observed red-breasted nuthatches: were seen in Douglas 铿乺s, in ponderosa pines, and in other types of trees. Do these data suggest that nuthatches prefer particular types of trees when they鈥檙e searching for seeds and insects? Carry out a chi-square goodness-of-铿乼 test to help answer this question.
No answer Explain carefully how nonresponse could lead to bias in this project
Refer to Exercise 37. Do the data provide convincing evidence of a difference in the effectiveness of the four treatments? Carry out an appropriate test at the significance level
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