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From a sample of customers, a t value of 2.391 was used to calculate the confidence interval of the population mean of the

From a sample of customers, a "t" value of 2.391 was used to calculate the confidence interval of the population mean of the amount of time in minutes, each customer spent in the store, which ranged from 28.22 to 32.42. What sample size was used to calculate the confidence interval?

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