According to Labor Department statistics, the average U.S. work week shortened from 39 hours in the 1950s
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According to Labor Department statistics, the average U.S. work week shortened from 39 hours in the 1950s and early 1960s to 35 hours in the 1990s. Assume the two statistics are based on independent t samples of 2,500 workers each, and the standard deviations are both 2 hours.
a. Test for significance of change.
b. Give a 95% confidence interval for the difference.
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a 2500 39 2500 35 s 1 s 2 2 05 H 0 ...View the full answer
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Saikumar Ramagiri
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Related Book For 
Complete Business Statistics
ISBN: 9780077239695
7th Edition
Authors: Amir Aczel, Jayavel Sounderpandian
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