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Homer's Pizza, which predominantly delivers within the certain distance, has just changed its delivery process in an effort to reduce the mean time between the order and completion of delivery from the current 20 minutes. A sample of 49 orders using the new delivery process yield a sample mean of 22.5 minutes and a sample standard deviation of 3.5 minutes.
a) Using the six-step critical value approach, at the 0.05 level of significance, is there evidence that the population mean delivery time has been reduced below the previous population mean value of 20 minutes?
b) At the 0.01 level of significance, use the five step p-value approach. (hint: use PHStat or other means to calculate the p-value)
c) Compare your conclusions in (a) and (b).
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More than 19 of them eat this brand of cereal 3) between 12 and 17 (inclusive) of them eat this brand of cereal? 4) find the mean and standard devation.
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The measurements (in millimeters) for the period from 8:00 a.m. to 10:30 a.m. follow. Use Microsoft Excel to design a mean chart and a range chart. Is the process in control or out of control?
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