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Show your solutions using PhStat only 1.An automobile shop manager timed six employees and found that the average time it took them to change a

Show your solutions using PhStat only

1.An automobile shop manager timed six employees and found that the average time it took them to change a water pump was 18 minutes and he standard deviation was 3 minutes. Assuming a normal population, find the 99% confidence interval of the true mean. Interpret the interval estimate.

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