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14. A cellular lephone company recently conducted research into the length of calls (in minutes) made by customers. In a random sample of 30 calls,

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14. A cellular lephone company recently conducted research into the length of calls (in minutes) made by customers. In a random sample of 30 calls, the sample mean was ? = 18.6 minutes and the standard deviation was s - 5.2 minutes, Construct and interpret a 90% confidence interval for true mean call length. (4-step process)

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