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The average local cell phone call length was reported to be2.39minutes.A random sample of23phone calls showed an average of2.95minutes in length with a standard deviation
The average local cell phone call length was reported to be2.39minutes.A random sample of23phone calls showed an average of2.95minutes in length with a standard deviation of0.99minutes.At =0.01,can it be concluded that the average differs from the population average? Assume that the population is approximately normally distributed.
(c) Compute the testvalue.Always roundt score values to at least three decimalplaces.
T= ____
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