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A surbey of 200 workers was asked how much they use the internet at work. 150 said they used it within limits, and 30 said they did not use the internet at work.

Construct a 99% confidence interval estimate for the proportion of all workers who did not use the internet at work

If you want to be 95% confidence of estmating the population mean to within a sampling error of +-4 and the standard deviation is assumed to be 10, what sample size is required?

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