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Of the total, 100 businesses were randomly extracted. The average after-tax benefit of the sample is...

Of the total, 100 businesses were randomly extracted. The average after-tax benefit of the sample is $80,000; Assume the parent standard deviation is $15,000.

Obtain a 95% confidence interval for the average tax return of the population business. And explain why the confidence interval formula can be used in the above issues even if the population is not necessarily normally distributed.

Math   Statistics-And-Probability   
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