The following data represent the battery life, in hours, for a random sample of 10 charges on a fifth generation iPod music player.   7.3  10.2  12.9  10.8  12.1 6.6  10.2   9.0   8.5   7.1 10) How large a sample would be necessary to estimate the mean number of hours the battery will last on the player with a margin of error of .5 with 97% confidence? Since the population standard deviation σ is not known use the sample standard deviation s from problem 2.

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