The average hourly wage of computer programmers with 2 years of experience has been $21.80. Because of high demand for computer programmers, it is believed there has been a significant increase in the average hourly wage of computer programmers. To test whether or not there has been an increase, the correct hypotheses to be tested are
A. H0: ?< 21.80 Ha: ?? 21.80.
B. H0: ? = 21.80 Ha: ?? 21.80.
C. H0: ?> 21.80 Ha: ?? 21.80.
D. H0: ?? 21.80 Ha: ?> 21.80.
Answer: D
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