In order to better understand a particular metal-stamping process, a manufacturer wishes to estimate the mean length of

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In Order To Better Understand A Particular Metal Stamping Process A Manufacturer Wishes To Estimate The Mean Length Of 1 (196.32 KiB) Viewed 40 times

In order to better understand a particular metal-stamping process, a manufacturer wishes to estimate the mean length of items produced by the process during the past 24 hours. a. How many parts should be sampled in order to estimate the population mean to within 0.2 millimeter (mm) with 90% confidence? Previous studies of this machine have indicated that the standard deviation of lengths produced by the stamping operation is about 2.5 mm. b. Time permits the use of a sample size no larger than 324. If a 90% confidence interval for µ is constructed using n = 324, will it be wider or narrower than would have been obtained using the sample size determined in part a? Explain. c. If management requires that u be estimated to within 0.2 mm and that a sample size of no more than 324 be used, what μ is (approximately) the maximum confidence level that could be attained for a confidence interval that meets management's specifications? a. At least (Round up to the nearest whole number.) purchasing managers should be included in the sample. b. The confidence interval will be (1). sampling error will (3) c. The maximum confidence level that meets the specifications is (Round to one decimal place as needed.) (1) O wider narrower (2) larger (3) smaller because the sample size of 324 is (2). increase. decrease. %. so the