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Question
In a manufacturing facility producing fasteners, a foreman suspects that the diameter of the bolts produced by his second-shift workers is greater than the diameter of the bolts produced by his first-shift workers. He takes a sample of five bolts from the first shift and a sample of four bolts from the second shift and measures the diameters in inches. The population of bolt diameter measurements is not normally distributed. Which one of the following nonparametric tests is appropriate for this problem?A. Wilcoxon signed ranks test
B. Wilcoxon rank sum test
C. sign test
D. Kruskal-Wallis test
E. Spearman's rank correlation test
Answer
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A. average
B. median
C. sum
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A. Wilcoxon rank sum test
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If a company is using an chart for a given process with measurement data, it is generally not important or necessary to use an R chart or s chart.
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Control charts are used to reduce common causes of variation.
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A sequence of steadily decreasing points on a control chart is called run down.
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An chart is a control chart on which individual process measurements are plotted versus time.
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