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An efficiency study was done on the delivery of first-class mail originating from the four cities listed in the following table. Recorded for each city was the average length of time (in days) that it took a letter to reach a destination in that same city. Samples were taken on two occasions, Sept. 1,2001 and Sept. 1, 2004.
Sept 1, 2001
Sept. 1, 2004
The mean driving time is 35 minutes with a standard deviation is 10 minutes. What is the 98 percent confidence interval for the population mean?
A manufacturer of dodge balls uses a machine to inflate its new balls to a pressure of 13.5 pounds (σ =0.1). When the machine is properly calibrated, the mean inflation pres
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