Chapter 11: Q.55 (page 730)
The degrees of freedom for the chi-square test for this two-way table are (a) .
(b) .
(c) .
(d) .
(e) None of these.
Short Answer
The degree of freedom is . Therefore, the correct option is (a).
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Chapter 11: Q.55 (page 730)
The degrees of freedom for the chi-square test for this two-way table are (a) .
(b) .
(c) .
(d) .
(e) None of these.
The degree of freedom is . Therefore, the correct option is (a).
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How do U.S. residents who travel overseas for leisure differ from those who travel for business? The following is the breakdown by occupation:

Explain why we can鈥檛 use a chi-square test to learn whether these two distributions differ significantly.
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?
Aw, nuts! Calculate the chi-square statistic for the data in Exercise . Show your work.
A large distributor of gasoline claims that all cars stopping at their service stations choose regular unleaded gas and that premium and supreme are each selected of the time. To investigate this claim, researchers collected data from a random sample of drivers who put gas in their vehicles at the distributor's service stations in a large city. The results were as follows:

Carry out a significance test of the distributor's claim. Use a significance level.
Sample surveys on sensitive issues can give different results depending on how the question is asked. A University of Wisconsin study randomly divided 2400 respondents into three groups. All participants were asked if they had ever used cocaine. One group of 800 was interviewed by phone; 21% said they had used cocaine. Another 800 people were asked the question in a one-on-one personal interview; 25% said 鈥淵es.鈥 The remaining 800 were allowed to make an anonymous written response; 28% said 鈥淵es.鈥
1. Was this an experiment or an observational study? Justify your answer.
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