A simple random sample of 50 stainless steel sheet metal screws is obtained from those suppled by
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A simple random sample of 50 stainless steel sheet metal screws is obtained from those suppled by Crown Bolt, Inc., and the length of each screw is measured using a vernier caliper. The lengths are listed in Data Set 19 of Appendix B. Assume that the standard deviation of all such lengths is 0.012 in., and use a 0.05 significance level to test the claim that the screws have a mean length equal to 3 4 in. (or 0.75 in.), as indicated on the package labels. Do the screw lengths appear to be consistent with the package label?
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