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A recent study showed that the residents of a local town reported sleeping an average of M: 7.76 hours each night with a standard deviation

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A recent study showed that the residents of a local town reported sleeping an average of M: 7.76 hours each night with a standard deviation of 0': 0.444. A random sample of 17 residents had a sample mean of 3?: 7789. Find the zvalue of this sample mean. Write your answer to two decimal places

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