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A phone company has conducted a study of the time its clients spend talking on their cellular phones each day. For a sample of 10

A phone company has conducted a study of the time its clients spend talking on their cellular phones each day. For a sample of 10 clients the company has obtained a sample standard deviation of 13.3 minutes. We assume that the talk time follows a normal distribution. The confidence interval at the 90% level for the standard deviation of the talk time in the population is

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