Executives whose wives stay at home earn more was the


Confidence Intervals for Means

"Executives Whose Wives Stay at Home Earn More" was the headline for an article that appeared in the San Luis Obispo Telegram-Tribune (Oct. 14, 1994). To support this claim, the article presented data from a random sample of 231 married men who received MBA degrees in the late 1970s. The data are:

n Mean Salary Standard Deviation

Two-income family 140 $95,140 $15,000

Sole source of income 91 $124,510 $18,000

Construct a 95% confidence interval for the difference in these means.

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Business Economics: Executives whose wives stay at home earn more was the
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