A random sample of 87 airline pilots recruited by an airline service 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 of the population, what is the value of t?b.Develop a 95% confidence interval for the average yearly income of all pilots.
What will be an ideal response?
| a. | 1.988 |
| b. | $96,842.37 to $101,957.63 |
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Why does the combined total of individual account performance materialities exceed the estimate of planning materiality?
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