A survey of 21 business intelligence analysts who had been, Basic Statistics

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A survey of 21 business intelligence analysts who had been

Question: A survey of 21 business intelligence analysts, who had been in their current positions from 10 to 20 years, revealed $90,734 as the average salary. Assume a random sample with a standard deviation of $15,000.

a. Find the 95% confidence interval for the population mean salary.

b. Find the 99% confidence interval for the population mean salary.

c. Complete the following sentence: We are 95% sure that the population means salary is at least.

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