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A local electronics firm wants to determine their average daily sales (in dollars.) A sample of...

A local electronics firm wants to determine their average daily sales (in dollars.) A sample of the sales for 25 days revealed an average sales of $139,000. Assume that the standard deviation of the population is known to be $12,000.

a. Provide a 88.3% confidence interval estimate for the true average daily sales.
b. Provide a 99.9% confidence interval estimate for the true average daily sales.
Math   Statistics-And-Probability   
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Sigma is known we use z distribution.

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