A company wants to estimate the mean number of hours per week adults use computers at home. What is the minimum sample size that is required to estimate the mean correct to within 0.2 of an hour (E...

How do I find the confidence level?

Extracted text: A company wants to estimate the mean number of hours per week adults use computers at home. What is the minimum sample size that is required to estimate the mean correct to within 0.2 of an hour (E =0.2) with a 99% confidence level? The company assumes o is 1 hour.