A simple random sample of 50 stainless steel sheet metal screws is obtained from those supplied 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. 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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Data Set 19: Screw Lengths (inches) All screws are stainless steel sheet metal screws from packages with labels indicating that the screws have a length of 3/4 in. (or 0.75 in.). The screws are supplied by Crown Bolt, Inc., and the measurements were made by the author using a vernier caliper. STATDISK: Minitab: Excel: TI-83/84 Plus: Text file name: Data set name is Screws. Worksheet name is SCREWS.MTW. Workbook name is SCREWS.XLS. App name is SCREWS, and the file names are the same as for text files. Text file name is SCRWS. 0.757 0.723 0.754 0.737 0.757 0.741 0.740 0.758 0.724 0.739 0.736 0.735 0.744 0.758 0.765 0.756 0.738 0.742 0.744 0.738 0.763 0.756 0.760 0.768 0.758 0.735 0.740 0.743 0.737 0.737 0.722 0.741 0.743 0.742 0.760 0.750 0.759 0.754 0.758 0.757 0.724 0.757 0.761 0.742 0.734 0.754 0.725 0.761 0.758 0.756