The average hourly earnings of production workers in manufacturing industries in 15 eastern and southeastern states as of
November 1975 are given below*:
(a) Find a 90% confidence interval for µ, the true average
hourly earnings in these states assuming normality.
(b) Find an approximate 90% confidence interval for n, the true
median hourly earnings in these states.
(c) Which interval would you prefer. Why?
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