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(Solved): A random sample of 12 shearing pins is taken in a study of the Rockwell hardness of the head of the ...
A random sample of 12 shearing pins is taken in a study of the Rockwell hardness of the head of the pin. Measurements on the Rockwell hardness were made for each of the 12 , yielding the measurements as in table below. Assuming the measurements to be normally distributed, construct a \( 90 \% \) confidence interval for the mean of the Rockwell hardness.
Expert Answer
Let X : measurement on the Rockwell hardness. Given, the measurements are normally distributed. , both are unknown. Since population standard