A precision control engineer is interested in the mean length of tubing being cut automatically by machine. It is known that the standard deviation in the cutting length is 0.15 feet. A sample of 60 cut tubes yields a mean length of 12.15 feet. This sample will be used to obtain a 99% confidence interval for the mean length cut by machine
a. What is the z? / 2 value to use in obtaining the confidence interval?
b. Develop the 99% confidence interval for ?.
a. z? / 2 = 2.58
b. LCL = 12.10 and UCL = 12.20 (feet)
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