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In a survey of customer service call duration, a sample of 25 calls has an average duration of 4.5 minutes with a standard deviation of

In a survey of customer service call duration, a sample of 25 calls has an average duration of 4.5 minutes with a standard deviation of 1 minute. Test the alternate hypothesis that the mean call duration, ?, is less than 4.8 minutes. What is the p-value of your test

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