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[Solved] The TUF Telephone Company provides long-distance service in an area. According to the company's records, the average length of all long-distance

Question: The TUF Telephone Company provides long-distance service in an area. According to the company's records, the average length of all long-distance calls placed through this company in 1998 was 12.35 minutes. The company's management wanted to check if the mean length of the current long-distance calls is different from 12.35 minutes. A sample of 200 such calls placed through this company produced a mean length of 13.42 minutes with a sample standard deviation of 2.71 minutes. Using = 0.05 can you conclude that the mean length of all current long-distance calls is different from 12.35 minutes?

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