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Question
In a sample of n = 16 selected from a normally distributed population, we find a population standard deviation of s = 10. What is the value of x2 if we are testing H0: 
2 = 144?
Answer
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A. average
B. median
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The __________________ is a nonparametric counterpart of a small-sample t test for comparing two independent population locations.
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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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Q:
How well a process is able to meet the requirements set forth by the process design is called
A. process leeway.
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Q:
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B. an upward trend on the R chart.
C. a downward trend on the R chart.
D. an increasing gradual funnel pattern on the R chart.
E. a decreasing gradual funnel pattern on the R chart.
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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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A. 50.05
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A motorcycle manufacturer produces the parts for its vehicles in different locations and transports them to its plant for assembly. To keep the assembly operations running efficiently, it is vital that all parts be within specification limits. One important part used in the assembly is the engine camshaft, and one important quality characteristic is the case hardness depth. Specifications state that the hardness depth must be between 3.0 mm and 6.0 mm. To investigate the process, the quality control engineer selected 25 daily subgroups of n = 5 and measured the hardness depth. The process yielded a mean of the means = 4.50 and an average range = 1.01. Calculate the center line for the X-bar chart.
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C. 3.49
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