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Chapter 20: Statistical Methods for Quality Control
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__________ consists of making a series of inspections and measurements to determine whether quality standards are being met.
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Quality assurance
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Quality control
As the sample size is increased, the limits of the control chart are farther apart.
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True
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False
If all points are within the control limits, the process is in control.
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True
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False
Randomly occurring variations that a manufacturer cannot control are called
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assignable causes.
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common causes.
A process is in control if μ = 20 and σ = 1. Give the control limits for an
chart for a sample of size 10.
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17 to 27
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19 to 21
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19.05 to 20.95
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19.68 to 20.32
A process is sampled 15 times with a sample size of 10, x double bar = 20 and R bar = 1. Find the control limits for the
chart
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16.922 to 23.078
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18 to 22
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19.05 to 20.95
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19.692 to 20.308
A process is sampled 15 times with a sample size of 10, x = 20 and R = 1. Find the control limits for the R chart.
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0 to 3
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0 to 12.586
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0.347 to 1.653
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19.692 to 20.308
The control chart that may be used to monitor the range of the measurements in the sample is the
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np chart.
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p chart.
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R chart.
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x bar chart.
The control chart that may be used to monitor the number of defective items in the sample is the
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np chart
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p chart
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R chart
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x bar chart
When acceptance sampling, the probability distribution used to compute the probability of accepting a lot is the
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binomial.
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exponential.
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normal.
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Poisson.
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None of the above.
When acceptance sampling, the consumer's risk is denoted
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α
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β
The maximum number of defective items that can be found in the sample and still indicate an acceptable lot is called the
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acceptance criterion
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binomial distribution
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control limit
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operating characteristic
Consider an acceptance sampling plan with n = 12 and c = 0. Find the probability of accepting a lot that has a defect rate of 3%.
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0.2575
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0.3061
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0.6938
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0.7847
Consider an acceptance sampling plan with n = 12 and c = 0. Find the producer's risk if the lot has a defect rate of 3%.
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0.2575
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0.3061
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0.6938
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0.7847
In acceptance sampling, as the acceptance number c is increased, the producer's risk increases.
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True
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False
OK
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