A research group wishes to estimate the mean number of hours that high school students spend watching TV on a weekday. A margin of error of E=0.20 hour is desired. Past studies suggest that a population standard deviation of σ=2.62.6 hours is reasonable.   Estimate the minimum sample size required to estimate the population mean with​ 95% confidence.   The required sample size is ________. ​(Round up to the nearest whole​ number.)

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