Question: In order to determine whether or not there is a significant difference between the mean hourly wages paid by two companies (of the same industry),

In order to determine whether or not there is a significant difference between the mean hourly wages paid by two companies (of the same industry), the following data have been accumulated.

Company ACompany BSample size80, 60 . Sample mean$16.75 $16.25 . Population standard deviation$1.00 and $.95

At the 5% level of significance, the null hypothesis

a. should be revised.

b. should not be rejected.

c. should not be tested.

d. should be rejected.

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