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The manager of Pankaj's ShopMart wants to estimate the mean time a customer spends in the store. Based on a pilot study, the standard deviation

The manager of Pankaj's ShopMart wants to estimate the mean time a customer spends in the store. Based on a pilot study, the standard deviation of the population is estimated to be 3 minutes. The manager requires the estimate to be within plus or minus 1 minute. The level of confidence is 90%. What sample size is needed?

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