Cement for Building a Dam Is Delivered by Truck

Cement for building a dam is delivered by truck.The dispatcher wants to estimate the average driver time required to load,drive to the dam,unload,and drive back to the plant.The time is assumed to be normally distributed.Total time required is recorded for a random sample of 18 with a mean of 543.71 and a standard deviation of 69.83.Use these data to obtain an 80-percent confidence interval for the average driver time.
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