OPMA CH. 10 MC PART 3 Q&A
Quality control charts usually have a central line and upper and lower control limit lines. Which of the
following are reasons that the process being monitored with the chart should be investigated?
A. A single plot falls above or below the control limits
B. Normal behavior
C. A large number of plots are on or near the central line
D. No real trend in any direction
E. A change in raw materials or operators - CORRECT ANSWER✅✅✅A
If there are 120 total defects from 10 samples, each sample consisting of 10 individual items in a
production process, which of the following is the fraction defective that can be used in a "p" chart for
quality control purposes?
A. 120
B. 10
C. 8
D. 1.2
E. 0.8 - CORRECT ANSWER✅✅✅D
, If there are 400 total defects from 8 samples, each sample consisting of 20 individual items in a
production process, which of the following is the fraction defective that can be used in a "p" chart for
quality control purposes?
A. 400
B. 160
C. 2.5
D. 1.0
E. 0.4 - CORRECT ANSWER✅✅✅C
You want to determine the upper control line for a "p" chart for quality control purposes. You take
several samples of a size of 100 items in your production process. From the samples you determine the
fraction defective is 0.05 and the standard deviation is 0.01. If the desired confidence level is 99.7
percent, which of the following is the resulting UCL value for the line?
A. 0.39
B. 0.08
C. 0.06
D. 0.05
Quality control charts usually have a central line and upper and lower control limit lines. Which of the
following are reasons that the process being monitored with the chart should be investigated?
A. A single plot falls above or below the control limits
B. Normal behavior
C. A large number of plots are on or near the central line
D. No real trend in any direction
E. A change in raw materials or operators - CORRECT ANSWER✅✅✅A
If there are 120 total defects from 10 samples, each sample consisting of 10 individual items in a
production process, which of the following is the fraction defective that can be used in a "p" chart for
quality control purposes?
A. 120
B. 10
C. 8
D. 1.2
E. 0.8 - CORRECT ANSWER✅✅✅D
, If there are 400 total defects from 8 samples, each sample consisting of 20 individual items in a
production process, which of the following is the fraction defective that can be used in a "p" chart for
quality control purposes?
A. 400
B. 160
C. 2.5
D. 1.0
E. 0.4 - CORRECT ANSWER✅✅✅C
You want to determine the upper control line for a "p" chart for quality control purposes. You take
several samples of a size of 100 items in your production process. From the samples you determine the
fraction defective is 0.05 and the standard deviation is 0.01. If the desired confidence level is 99.7
percent, which of the following is the resulting UCL value for the line?
A. 0.39
B. 0.08
C. 0.06
D. 0.05
