A sample of 75 information systems managers had an average hourly income of $40.75 with a standard deviation of $7.00 . The 95% confidence interval for the average hourly wage (in $) of all information system managers is

a. 38.61 to 42.89.
b. 39.40 to 42.10.
c. 39.14 to 42.36.
d. 37.54 to 43.96.


c

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