Solution-Research on the duration of calls initiated

Research on the duration of calls initiated

Reference no: EM131083925

A legislative aide is doing research on the duration of calls initiated on car cellular phones. A preliminary study showed that the standard deviation of these calls is 1.6 minutes. How large a sample will be needed for the aide to be able to state with 99% confidence that the sample mean duration time for the calls differs from the population mean by no more than 0.20 minutes?

Reference no: EM131083925

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Research on the duration of calls initiated

Reference no: EM131083925

Reference no: EM131083925

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