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This activity contains 15 questions.

Question 1.
Which of the following statements about variables is true?

End of Question 1

Question 2.
When using variables control charts, one should read:

End of Question 2

Question 3.
The equation for the standard error of the mean is:

End of Question 3

Question 4.
If a process is in a state of statistical control, the variability between subgroups will be:

End of Question 4

Question 5.
Give the preferred method for detecting shifts in process average.

End of Question 5

Question 6.
The ratio of the range of a sample (from a normal distribution) to the standard deviation of the distribution is:

End of Question 6

Question 7.
As the sample size increases, the best measure of variability is:

End of Question 7

Question 8.

Three process and sampling schemes are listed below.

I. Product is produced in a batch process. The well-mixed, unsettled batch is sampled at the end of the run.
II. Product is produced continuously at a high flow rate and is sampled each hour.
III. Product is produced continuously at a low flow rate and is sampled minimally to avoid product loss.

Choose the scheme that would require individual values charts.
End of Question 8

Question 9.
The ____________ method estimates process variability by considering differences between consecutive observations.

End of Question 9

Question 10.
If trends are present in the data the moving range method tends to ________________ ch07-10a.gif and result in control limits that are too ______________.

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Question 11.
The assumption of normal data distribution is most important in the use of:

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Question 12.
The statistic used in exponentially weighted moving average charts is:

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Question 13.
Another term for the target value is the:

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Question 14.
The natural tolerance limits of a process are:

End of Question 14

Question 15.
The equation for the ch07-15a.gif index is:

End of Question 15

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