Light bulbs are tested for 30 Samples. minance. Random samples of 5 are chosen. The summary inTormation below is for 30 30 > xi = 2550 si = 195 i=1 i=1 The specification limits are 90+4 lumes a. Estimate the process standard deviation b. Assume that all points on both charts plot within the control limits. What are the natural tolerance limits of the process? What are your conclusion regarding the ability of the process to produce items conforming to specifications? Find Cp and Cpk. d. Assuming that if an item exceeds the upper specification limit it can be reworked and if it is below the lower limit it must be scrapped, what percent scrap and rework is the process now producing? e. It the process were cantered on at u = 90, what would be the effect on the percent scrap or rework?

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Statements and Logic

Logic is the analysis of general patterns of thoughts without regard to any specific sense of context.