To determine the average number of minutes it takes to manufacture one unit of a new product, an assembly line manager tracks a random sample of 15 units and records the number of minutes it takes to make each unit. The times are assumed to have a normal distribution. THe sample yields a mean of 3.92 minutes and standard deviation of 0.45 minutes. Using a 95% confidence interval, predict the mean assembly time for units of the new product.

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