Use $6\mathrm{.}88$ days as a planning value for the population standard deviation.

a$.$ Assuming $95\%$ confidence, what sample size would be required to obtain a margin of error of $1\mathrm{.}5$ days? Do not round intermediate calculations. Round your answer up to the nearest whole number.

b$.$ If the precision statement was made with $90\%$ confidence, what sample size would be required to obtain a margin of error of $2$ days? Do not round intermediate calculations. Round your answer up to the nearest whole number.

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Partially Correct