MGT393 Exam 4 questions and answers
graded A+ updated
You have just used the capability index (Cpk) formulas to compute the two values "min [2, 2.5]".
Which of the following is the proper interpretation of these numbers?
(a) The true capability index value is between 2 and 2.5
(b) The mean of the production process has shifted to the right of the design limits
(c) The true capability index value is 2.5
(d) The mean of the production process has shifted to the left of the design limits
(e) The mean has not shifted at all - correct answer ✔✔d
Quality control charts usually have a central line and upper and lower control limit lines. Which
of the following is not a reason that the process being monitored with the chart should be
investigated?
(a) There is a change in raw materials or operators
(b) Erratic behavior of the plots
(c) A large number of plots are close to the upper or lower control lines
(d) A run of five above the central line
, (e) A single plot falls above or below the control limits - 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? - correct answer ✔✔8
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? -
correct answer ✔✔0.08
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, which of the following would be the standard deviation used in developing the control lines?
- correct answer ✔✔0.0335
For which of the following should we use a "p" chart to monitor process quality? - correct
answer ✔✔Grades in a freshman pass/fail
With which of the following should we use an "X-bar" chart based on sample means to monitor
process quality? - correct answer ✔✔Tire pressures
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? - correct answer ✔✔8.9
If you are going to develop an "X-bar" chart based on range statistics and you are using a sample
size of 12 for your charting purposes. Which of the following is the A2 factor for the "X-bar"
chart? - correct answer ✔✔0.27
graded A+ updated
You have just used the capability index (Cpk) formulas to compute the two values "min [2, 2.5]".
Which of the following is the proper interpretation of these numbers?
(a) The true capability index value is between 2 and 2.5
(b) The mean of the production process has shifted to the right of the design limits
(c) The true capability index value is 2.5
(d) The mean of the production process has shifted to the left of the design limits
(e) The mean has not shifted at all - correct answer ✔✔d
Quality control charts usually have a central line and upper and lower control limit lines. Which
of the following is not a reason that the process being monitored with the chart should be
investigated?
(a) There is a change in raw materials or operators
(b) Erratic behavior of the plots
(c) A large number of plots are close to the upper or lower control lines
(d) A run of five above the central line
, (e) A single plot falls above or below the control limits - 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? - correct answer ✔✔8
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? -
correct answer ✔✔0.08
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, which of the following would be the standard deviation used in developing the control lines?
- correct answer ✔✔0.0335
For which of the following should we use a "p" chart to monitor process quality? - correct
answer ✔✔Grades in a freshman pass/fail
With which of the following should we use an "X-bar" chart based on sample means to monitor
process quality? - correct answer ✔✔Tire pressures
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? - correct answer ✔✔8.9
If you are going to develop an "X-bar" chart based on range statistics and you are using a sample
size of 12 for your charting purposes. Which of the following is the A2 factor for the "X-bar"
chart? - correct answer ✔✔0.27
