Unformatted text preview: sample 7) If you increase the sample size in a study, what effect does that have on your margin of error if all other quantities are held constant? Solution: Margin of error decreases 8) A simple random sample of 2500 Americans shows that 1800 feel the president is performing well. Calculate the percent of the sample that feel the president is performing well. Solution: 72% 9) A simple random sample of 2500 Americans shows that 1800 feel the president is performing well. Calculate the margin of error for this percent. Solution: 2% 10) Suppose the president approval rating is 40% with 3% as the margin of error. Which of the following is the correct confidence statement? Solution: We are 95% confident that the percentage of Americans who feel the president is performing well is between 37% and 43%....
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 Fall '10
 Bradley,W
 Statistics, Simple random sample

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