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Chapter 11: Q. 7 (page 734)
The appropriate degrees of freedom for the statistic is
(a) 1 .
(b) 2 .
(c) 3 .
(d) 4 .
(e) 5 .
Option is the correct answer.
The appropriate degrees of freedom for the statistic is .
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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?
What conclusion would you draw? Justify your answer.
An appropriate null hypothesis to test whether the trees in the forest are randomly distributed is
(a) , where the mean number of trees in each quadrant.
(b) , where the proportion of all trees in the forest that are in Quadrant
(c) , where is the number of trees from the sample in Quadrant .
(d) , where is the actual proportion of trees in the forest that are in Quadrant .
(e) , where is the proportion of trees in the sample that are in Quadrant
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?
Design (4.2) Was this an observational study or an experiment? Justify your answer.
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