Confidence interval for the mean income


A statistician calculates a 95% confidence interval for the mean income of the depositors at Bank A.

The confidence interval is 18,600 to 21,400.(try to use the formula for confidence interval)

a. What is the mean income in the sample?

b. If sigma=$5,000, what was the sample size, n?

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Basic Statistics: Confidence interval for the mean income
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