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STA 301 - HW10

# STA 301 - HW10 - STA 301 Applied Statistics Spring 2008...

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STA 301 – Applied Statistics Spring 2008, Section B Homework #10 Due Wednesday, April 16 Question 1 : Prior to a national election, a Democratic campaign staffer conducted an opinion poll to determine the percentage of votes his candidate could expect to receive. He collected a random sample of 1225 likely voters, 54% of whom planned to vote for the Democratic candidate. (a) Construct a 95% confidence interval for the true percentage of people who would vote for the Democratic candidate in the election. (b) At the 95% confidence level, could the staffer conclude that the Democratic candidate would win the election? Why or why not? (c) Extra credit! (I’m not kidding.) Assume the only other candidate on the ballot was a Republican, and there were no write-in votes cast. Construct a 95% confidence interval for the Democrat’s margin of victory (or loss, if negative).

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STA 301-B, Spring 2008 Homework 10 Page 2 of 5 Question 2 : The mean length of imprisonment for motor-vehicle theft offenders in Australia is 16.7
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STA 301 - HW10 - STA 301 Applied Statistics Spring 2008...

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