(Answered) These are pretty similarthe population standard deviation

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These are pretty similar:

The population standard deviation of the number of people who shop online is 3.1. If you want to be 99% confident that the sample mean is within 2% of the population mean, how many people must be surveyed.

You're collecting information on salaries of IT workers. You know the population standard deviation of the salaries is $2125. You want to be 99% confident you are within $750 of the population mean. How many people do you need to survey?

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