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A poll was taken every month on how voters will vote on the next federal election
Sample Size Number of Voters Voting Liberal
This month 750 300
Last month 800 280
1. Develop a 95% confidence interval estimate for the difference between the proportions of voters who will vote for the Liberals in the two samples?
2. Is there conclusive evidence that one of the proportions is significantly different from the other? Explain using the results of part a. Do not perform any test?
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A study based on sample of size 144 reported a sample proportion of 0.87 and a margin of error of 0.055 for 95% confidence. Give the 95% confidence interval
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