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A cell phone manufacturer claims that its phone will last for more than 8 hours of continuous talk time when the battery is fully charged.  To test this claim a sample of n = 18 phones were tested.  The results showed a sample mean of 8.2 hours and a sample standard deviation of 0.4 hours. Conduct the hypothesis test using 0.05 level of significance and determine whether or not the company's claim is supported.

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