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A company that manufactures tools want to estimate the average output of a machine to within a margin of error of ±2.1 units with 90% confidence. A preliminary pilot study found that the sample standard deviation of the machine's output is 7.3 units.

1) What is the preliminary estimate n∗?

2) What is the sample size n? The critical value when df=32 is t∗=1.694.

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Answered by AVIRAL_ on coursehero.com

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