A statistician wants to estimate the mean weekly family expenditure on clothes. He believes that the largest weekly expenditure is $650 and the lowest is $150.
a. Estimate the standard deviation of the weekly expenditure.
b. Determine with 99% confidence the number of families that must be sampled to estimate the mean weekly family expenditure on clothes to within $15.

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The Answer of A statistician wants to estimate the mean weekly family expenditure on clothes. He believes that the largest weekly expenditure is $650 and the lowest is $150.
a. Estimate the standard deviation of the weekly expenditure.
b. Determine with 99% confidence the number of families that must be sampled to estimate the mean weekly family expenditure on clothes to within $15.

A Statistician Wants to Estimate the Mean Weekly Family Expenditure