The average manufacturing work week in metropolitan Chattanooga was 40.2 hours last year. It is believed that the recession has led to a reduction in the average work week. To test the validity of this belief, the hypotheses are
A. H0: ?< 40.2 Ha: ?? 40.2.
B. H0: ?? 40.2 Ha: ?< 40.2.
C. H0: ?> 40.2 Ha: ?? 40.2.
D. H0: ?= 40.2 Ha: ?? 40.2.
Answer: B
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