. ( Find the sample size. a) You want to estimate the percentage of adults who buy clothing online. How many adults must be surveyed to be 95% confident that the sample percentage is in error by no more than four percentage points? b) You want to estimate the mean amount of charitable contributions made by college graduates. How many graduates must you survey to be 90% confident that your sample mean is in error by no more than $50?  Assume that the population standard deviation of donations by graduates is $360.

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