A sample of 100 information systems managers had an average hourly income of $40.00 with a standard deviation of $8.00. The 95% confidence interval for the average hourly wage (in $) of all information system managers is   Question 23 options:   a)  32 to 48.   b)  38.432 to 41.568.   c)  39 to 41.   d)  38.684 to 41.316.

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