Statistical analysis of telephone calls A random sample of 50 long-distance phone calls was made by Crabbis
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Statistical analysis of telephone calls A random sample of 50 long-distance phone calls was made by Crabbis Company in an effort to determine if restrictions should be placed on long distance calling. The sample has a mean of 16.3 minutes with a standard deviation of 6.5 minutes.
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REQUIRED a. Determine what percentage of phone calls is longer than 20 minutes in duration. b. What is the length of phone calls 95 percent of the time? c. In what range does the population mean of phone calls fall with a 95 percent probability? d. If management wants to estimate the mean length of phone calls with a 95 percent probability within an error of 1 minute, how large a sample should it take?
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