Cell Phone Call Lengths The average local cell phone call
Chapter 8, Problem 7(choose chapter or problem)
Cell Phone Call Lengths The average local cell phone call length was reported to be 2.27 minutes. A random sample of 20 phone calls showed an average of 2.98 minutes in length with a standard deviation of 0.98 minute. At a _ 0.05 can it be concluded that the average differs from the population average? Source: World Almanac.
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