1. A team at a factory is monitoring the average number of defects in TV screens. Thirty-five TV screens are randomly selected each day over a 25-day period. The average number of defects per TV screen was found to be ubar = 0.73. What is the upper control limit for a corresponding u-chart? a. 1.24 b. 1.16 c. 0.22 d. 0.3
1. A team at a factory is monitoring the average number of defects in TV screens. Thirty-five TV screens are randomly selected each day over a 25-day period. The average number of defects per TV screen was found to be ubar = 0.73. What is the upper control limit for a corresponding u-chart?
a. 1.24
b. 1.16
c. 0.22
d. 0.3
2. Which of the following events would not be considered a source of common variation?
a. incorrect machine settings.
b. variations in temperature
c. measurement system variability
d. slight changes in customer arrivals to a store.
3. The diameter of a steel rod is a quality characteristic of interest. Samples size of 12 will be selected in the subgroups. Which of the following control charts is preferred to monitor the process variability?
a. Xbar and R chart
b. XBar and s chart
c. c-chart
d. p-chart
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