Question: Managers at a local AT T Wireless retail center have
Managers at a local AT& T Wireless retail center have a goal that 75% of the center’s customers will have to wait less than 5 minutes for service. The Excel file named AT& T.xlsx shows the wait times of a random sample of 160 customers in minutes. Use Excel’s COUNTIF function to count the number of successes. Does this sample provide evidence that management’s goal is being achieved?
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