A Random Sample of 87 Airline Pilots Had an Average

question 18

Short Answer

A random sample of 87 airline pilots had an average yearly income of $99,400 with a standard deviation of $12,000.
a.If we want to determine a 95% confidence interval for the average yearly income, what is the value of t?
b.Develop a 95% confidence interval for the average yearly income of all pilots.

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