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Mathematics, 22.10.2019 13:00 nelly1078

The life in hours of a thermocouple used in a furnace is known to be approximately normally distributed, with standard deviation σ = 20 hours. a random sample of 15 thermocouples resulted in the following data: 553, 552, 567, 579, 550, 541, 537, 553, 552, 546, 538, 553, 581, 539, 529. we wanted to be 95% confident that the error in estimating the mean life is less than 5 hours. what sample size should we use? round z-value to two decimal places in your intermediate calculations. round your answer up to the nearest whole number.

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