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Chapter 11: Q. 8 (page 734)
The expected count of cases of lymphoma in homes with an HCC is
(a) .
(b) .
(c) .
(d) .
(e) None of these.
a)
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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.
What is the most important reason that students buy from catalogs? The answer may differ for different groups of students. Here are results for separate random samples of American and Asian students at a large midwestern university
(a) Should we use a chi-square test for homogeneity or a chi-square test of association/independence in this setting? Justify your answer. (b) State appropriate hypotheses for performing the type of test you chose in part (a). Minitab output from a chi-square test is shown below.
(c) Check that the conditions for carrying out the test are met.
(d) Interpret the P-value in context. What conclusion would you draw?
Which of the following may we conclude, based on the test results?
(a) There is strong evidence of an association between wiring configuration and the chance that a child will develop some form of cancer.
(b) HCC either cause cancer directly or is a major contributing factor to the development of cancer in children.
(c) Leukemia is the most common type of cancer among children.
(d) There is not much evidence of an association between wiring configuration and the type of cancer that caused the deaths of children in the study.
Removing warts A recently reported study looked at the use of oral zinc supplements to get rid of warts. The treatment group took an oral zinc supplement. Of these people, were rid of their warts after one month, and additional patients were rid of them after two months. The subjects in a control group were given a placebo. Of these, was rid of his warts after one month and additional patients were rid of their warts after two months. The reported results of the study included this table.
(a) The researchers say they did a chi-square test on this table. Explain why that makes no sense. Then make a correct two-way table displaying the results of the experiment.
(b) Explain why it is not appropriate to use a chi-square test in this setting even with the correct two-way table.
Seagulls by the seashore Do seagulls show a preference for where they land? To answer this question, biologists conducted a study in an enclosed outdoor space with a piece of shore whose area was made up of % sand, % mud, and % rocks. The biologists chose seagulls at random. Each seagull was released into the outdoor space on its own and observed until it landed somewhere on the piece of shore. In all, seagulls landed on the sand, role="math" localid="1650465230449" landed in the mud, and role="math" localid="1650465221489" landed on the rocks. Carry out a chi-square goodness-of-铿乼 test. What do you conclude?
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