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Question
A paper presented at a recent meeting of higher education researchers compared the type of college that freshmen attend and the numbers who drop out. A random sample of freshmen shows the following results.
At a significance level of .05, determine the appropriate degrees of freedom and the rejection point condition for this test.
Answer
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A. average
B. median
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An assumption of the Wilcoxon rank sum test is that the variances of the two populations are equal.
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How well a process is able to meet the requirements set forth by the process design is called
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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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How well the design of the product meets and exceeds the needs and expectations of the customers is called the quality of performance.
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An chart is a control chart on which individual process measurements are plotted versus time.
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A manufacturer of windows produces one type that has a plastic coating. The specification limits for the plastic coating are 30 and 70. From time to time the plastic coating can become uneven. Therefore, in order to keep the coating as even as possible, thickness measurements are periodically taken at four different locations on the window. 15 subgroups were observed, each consisting of four thickness measurements, with the following results: mean of the means = = 50.05, and average range = 8.85. Calculate the center line for the R chart.
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