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.
d
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