QMS 202 Study Guide - Final Guide: Ravioli, Confidence Interval, Standard Deviation
10 Dec 2016
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In metal fabrication process, metal rods are produced to specified target length of 15 feet. Quality control specialist collects random sample of 16 rods and finds sample mean length to be 14. 8 feet and standard deviation of 0. 65 feet. standard error of mean is 0. 1625 ft. std error of mean. The 95% confidence interval for the true mean length of rods produced by this process is 14. 440ft ~ 15. 160ft. A manufacturer of cheese filled ravioli supplies pizza restaurant chain. Based on data collected from its automatic filling process, the amount of cheese inserted into the ravioli is normally distributed. To make sure that the automatic filling process is on target, quality control inspectors take sample of 25 ravioli. The correct value of t* to construct 98% confidence interval for the true mean amount of cheese filling is 2. 492.
