A random sample of 12 shearing pins is taken in a study of the Rockwell hardness of
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A random sample of 12 shearing pins is taken in a study of the Rockwell hardness of the head on the pin. Measurements on the Rockwell hardness were made for each of the 12, yielding an average value of 48.50 with a sample standard deviation of 1.5. Assuming the measurements to be normally distributed, construct a 90% confidence interval for the mean Rockwell hardness.
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n 12 x 4850 s 15 and to05 1796 w...View the full answer
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