Solved: The article The Foremans View of Quality Control(Quality Engr., 1990: 257280)
Chapter 8, Problem 22(choose chapter or problem)
The article The Foremans View of Quality Control(Quality Engr., 1990: 257280) described an investigationinto the coating weights for large pipes resulting from agalvanized coating process. Production standards call fora true average weight of 200 lb per pipe. The accompanyingdescriptive summary and boxplot are from Minitab.Variable N Mean Median TrMean StDev SEMeanctg wt 30 206.73 206.00 206.81 6.35 1.16Variable Min Max Q1 Q3ctg wt 193.00 218.00 202.75 212.00n 5 25, t 5 23.9n 5 25, t 5 22.6, a 5 .01a. What does the boxplot suggest about the status of thespecification for true average coating weight?b. A normal probability plot of the data was quite straight. Usethe descriptive output to test the appropriate hypotheses.
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