Question

1. The annual Incomes of a sample of middle-management employees at Westinghouse are $62,900, $69,100,

$58,300, and $76,800.

(a) What is the formula for the sample mean?

(b) Find the sample mean.

(c) is the mean you computed in (b) a statistic or a parameter? Why?

(d) What is your best estimate of the population mean?

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