Question

The lengths of pins produced by an automatic lathe are normally distributed. A random sample of 20 pins gives a sample mean of 0.992 inch and a sample standard deviation of 0.013 inch.
a. Give a 95% confidence interval for the average lengths of all pins produced.
b. Give a 99% confidence interval for the average lengths of all pins produced.


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  • CreatedJune 03, 2015
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