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# hw03 - afﬁliation of those surveyed(you only survey...

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06E:071, Fall 2011 due Sep. 20 Homework 3 1. Which test statistic do you use for the following two hypotheses? Write the null and alternative hypotheses for each problem and the test statistic you would use if you had ˆ p 1 , ˆ p 2 , n 1 and n 2 . Write out the test statistics as completely as possible (i.e., including the information from the hypotheses). (a) You survey citizens of Iowa City to find whether they approve of the new jobs bill proposed by the office of the President (respondents answer yes or no). You also note the party affiliation of those surveyed (you only survey people who identify themselves as Democrats or Republicans). You would like to test: does a higher proportion of Democrats approve of the bill than Republicans? (b) You survey citizens of Iowa City to find whether they approve of the new jobs bill proposed by the office of the President (respondents answer yes or no).
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Unformatted text preview: afﬁliation of those surveyed (you only survey people who identify themselves as Democrats or Republicans). You would like to test: does the proportion of Democrats who approve of the bill exceed that of approving Republicans by 10%? Show your work (i.e., do it by hand) for the next question. Question 3 can also easily be done by hand, but you can use a computer program to conduct tests after question 2, as long as you state the results of the test clearly — including test statistic, p-value and the decision you make in plain English. Questions 4 and 5 can be done by hand but it is easier to use a computer. 2. Exercise 9.24 (p. 559). Do this one by hand and show all your work. 3. Exercise 9.34 (p. 561). 4. Exercise 9.16 (p. 557). 5. Exercise 9.23 (p. 559). 1...
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