Exam 11: Statistically Based Quality Improvement for Variables

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One hundred percent samples are also known as screening samples.

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True

In a variables control chart, which of the following is likely to occur if large jumps of more than three or four standard deviations take place?

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A

Proportion defective, number defective, number nonconforming in a consistent sample space, and number defects per unit are examples of ________.

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Which of the following is an example of a variables chart?

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In a variables control chart, which of the following has likely occurred if two points in succession are farther than two standard deviations from the mean?

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Process stability means that the variation we observe in the process is ________ variation.

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In a variables control chart, large jumps of more than three or four standard deviations result in process drift.

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Design a control chart to monitor the gas mileage in your car. Collect the data over time.

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Random variation results from an event such as a shift in a process mean or some unexpected occurrence.

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A 50-volt battery must be between 55 and 45 volts when it leaves the factory. Two hundred samples of batteries have yielded the following data: average charge of 49 volts with a standard deviation of 2.5 volts. What is the probability of producing an out-of-spec battery?

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Producer's risk is also called a ________ error.

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Process control requires that data be gathered in samples. Discuss random sampling and systematic sampling and provide examples of each sampling method.

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Control chart limits should be updated only when there is a change to the process.

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World-class levels of process capability are measured by parts per million defect levels.

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To ________ means to sample in such a way that every piece of product has an equal chance of being selected for inspection.

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________ is the probability that a good product will be rejected.

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Statistical tools focus on causes rather than effects.

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Process stability means that the variation observed in the process is nonrandom variation and not random variation.

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Interlinking is useful in helping to identify causal relationships between variables.

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Which of the following is an example of an attributes chart?

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