Determine the p-value and interpret the meaning

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Reference no: EM132811308

Until now it was observed that the population mean waiting time to check out of a supermarket is at least 4 minutes. However, because of the holiday season, in an effort to reduce the mean waiting time, the supermarket has experimented with a system in which infrared cameras use body heat and in-store software to determine how many lanes should be opened. A sample of 101 customers was selected, and their mean waiting time to check out was found to be 3.25 minutes, with a sample standard deviation of 130 seconds.

Problem (a) Using the critical value approach is there any evidence that the effort to reduce the mean waiting time is successful?

Problem (b) Determine the p-value and interpret its meaning.

Reference no: EM132811308

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