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Question
Suppose that a realtor is interested in comparing the price of midrange homes in two cities in a midwestern state. She conducts a small survey in the two cities, looking at the price of midrange homes. Assume equal population variances.
Calculate the 95 percent confidence interval.
Answer
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A. average
B. median
C. sum
D. difference
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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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Nonparametric tests can be more powerful than the corresponding t or F tests if the population distribution is highly skewed or nonnormal.
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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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C. a downward trend 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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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 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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D. 0.90