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.
a. 1.988
b. $96,842.37 to $101,957.60
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