Question 1

Explain the difference between producer's risk and consumer's risk in acceptance sampling.

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Question 2

What is the difference between statistical process control (SPC)and statistical quality control (SQC)?

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Question 3

What does it mean when we say that a process is capable?

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Question 4

You want to determine the control lines for a "p" chart for quality control purposes.If the total number of defects from all samples is 560,the number of samples is 70 and the sample size is 80,what would be the standard deviation used in developing the control lines?

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Question 5

You want to develop a three-sigma "R" chart.You know the average range is 12 based on several samples of size 6.Which of the following is the resulting LCL?

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Question 6

You are developing an "X-bar" chart based on sample means.You know the standard deviation of the sample means is 4,the desired confidence level is 99.7 percent and the average of the sample means is 24.What is your UCL?

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Question 7

You are developing an "X-bar" chart based on sample means.You know the standard deviation of the sample means is 4,the desired confidence level is 99 percent and the average of the sample means is 20.What is your LCL?

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Question 8

If the fraction defective is 0.12 based on a sample size of 16,what is the standard deviation to be used when constructing a "p" chart?

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Question 9

If the fraction defective is 0.4 based on a sample size of 100,what is the standard deviation used in constructing the "p" chart?

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Question 10

All else being equal,how large is the effect of lot size on sample size?

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Question 11

You want to determine the control lines for a "p" chart for quality control purposes.If the total number of defects from all samples is 2,000,the number of samples is 100 and the sample size is 50,what would be the standard deviation used in developing the control lines?

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Question 12

You want to develop a three-sigma "R" chart.You know the average range is 5 based on several samples of size 10.Which of the following is the resulting UCL?

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Question 13

What is the symbol designating the capability index?

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Question 14

You have 75 total defects from 100 different samples of 15.What is p?

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Question 15

Lots are defined as low quality when the percentage of defective units is greater than what?

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Quiz 25: Process Capability and Spc