Give confidence interval for average lengths of pins produce

Reference no: EM131373636

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.

Reference no: EM131373636

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