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Motorola wishes to estimate the mean talk time for one of their new phones before the battery must be recharged. In a random sample of

Motorola wishes to estimate the mean talk time for one of their new phones before the battery must be recharged. In a random sample of 35 phones, the sample mean talk time is 325 minutes.

1. Construct a 98% Confidence Interval for the mean talk time for all new Motorola phones, assuming that the population standard deviation is 31 minutes.

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