Homework_10_Solutions

Homework_10_Solutions - Homework 10 Solutions 12.8 a Null...

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12.8 a. Null hypothesis because it is a statement of “no difference.” b. Alternative hypothesis because it states that there is a difference. c. Alternative hypothesis because it states that there is a difference. d. Null hypothesis. Even though the hypothesis includes values that indicate a difference, it also includes the statement that the proportions are equal. 12.11 a. H 0 : Female and male college students study the same average amount. H a : Female college students study more, on average, than male college students. The hypothesis test is one-sided. The alternative hypothesis gives a specific direction for a difference (females study more). b. H 0 : Bald men and men who are not bald are equally likely to have heart disease. H a : Bald men are more likely to have heart disease than men who are not bald. The hypothesis test is one-sided. The alternative hypothesis gives a specific direction for a difference (bald men are more likely to have heart disease). c. H o : There is no correlation between height and head circumference H a : There is a correlation between height and head circumference The hypothesis test is two-sided. No direction for the correlation is suggested in the research question and corresponding alternative hypothesis. d. H 0 : Increasing speed limits on interstate highways does not increase the fatality rate. H a : Increasing speed limits on interstate highways increases the fatality rate. The hypothesis test is one-sided. The alternative hypothesis specifies a single direction, a positive association between speed limits and fatality rates. e. H 0 : Probability = .5 that a coin spun on its edge lands heads up. H a : Probability .5 that a coin spun on its edge lands heads up. The hypothesis test is two-sided. The alternative hypothesis does not give a specific direction for how the probability might differ from .5. 12.13

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This note was uploaded on 12/06/2009 for the course STAT 200 at Penn State.

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Homework_10_Solutions - Homework 10 Solutions 12.8 a Null...

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