Question: Over the past 5 years, the mean time for a warehouse to fill a buyer's order has been 25 minutes. Officials of the company believe

Over the past 5 years, the mean time for a warehouse to fill a buyer's order has been 25 minutes. Officials of the company believe that the length of time has increased recently, either due to a change in the workforce or due to a change in customer purchasing policies. The processing times (in minutes) were recorded for a random sample of 15 orders processed over the past month.

Do the data present sufficient evidence to indicate that the mean time to fill an order has increased?

28 25 27 3 10 26 30 15 55 12 24 32 28 4 38

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