ISDS 3115 Test 2 MC Exam
Study Guide – Practice
Questions with Verified
Answers. GRADED A+. Latest
2026/2027 Update
*Natural variations: *
A) affect almost every production process.
B) are the many sources of variation that occur when a process is under control.
C) when grouped, form a pattern, or distribution.
D) are tolerated, within limits, when a process is under control.
E) All of the above are true. - Answer✔✔-E) All of the above are true.
*Natural variations:*
A) are variations that are to be identified and investigated.
B) are variations that can be traced to a specific cause.
C) are the same as assignable variations.
D) lead to occasional false findings that processes are out of control.
E) play no role in statistical process control. - Answer✔✔-d
,*Assignable variation:*
A) is a sign that a process is under control.
B) is to be identified and investigated.
C) is the same as random variation.
D) is variation that cannot be traced to a specific cause.
E) leads to a steep OC curve. - Answer✔✔-b
Control charts for variables are based on data that
come from: A) acceptance sampling.
B) individual items.
C) averages of small samples.
D) averages of large samples.
E) the entire lot. - Answer✔✔-c
The purpose of an x-bar chart is to determine whether there has
been a: A) change in the dispersion of the process output.
B) change in the percent defective in a sample.
C) change in the central tendency of the process output.
D) change in the number of defects in a sample.
E) change in the AOQ. - Answer✔✔-c
If a sample of items is taken and the mean of the sample is outside the control
limits, the process is:
,A) likely out of control and the cause should be investigated.
B) in control, but not capable of producing within the established control limits.
C) within the established control limits with only natural causes of variation.
D) monitored closely to see if the next sample mean will also fall outside the
control limits. E) producing high quality products. - Answer✔✔-a
*The causes of variation in statistical process
control are:* A) cycles, trends, seasonality, and
random variations.
B) producer's causes and consumer's causes.
C) mean and range.
D) natural causes and assignable causes.
E) Type I and Type II. - Answer✔✔-d
*The number of defects after a hotel room cleaning (sheets not straight,
smears on mirror, missed debris on carpet, etc) should be measured using
what type of control chart?* A) x-bar chart
B) R-chart
C) p-chart
D) c-chart
E) either x-bar chart or R chart - Answer✔✔-d
, *The number of late insurance claim payouts per 100 should be measured with
what type of control chart?* A) x-bar chart
B) R-chart
C) p-chart
D) c-chart
E) either p-chart or c-chart - Answer✔✔-c
The upper and lower limits for diving ring diameters made by John's Swimming
Co. are 40 and 39 cm., respectively. John took 11 samples with the following
average diameters (39, 39.1, 39.2,
39.3, 39.4, 39.5 39.6, 39.7, 39.8, 39.9, 40). Is the process in
control? A) Yes, no diameters exceeded the control limits.
B) No, some diameters exceeded the control limits.
C) No, there is a distinguishable pattern to the samples.
D) No, the range is not in control.
E) There is not enough information to make a decision. - Answer✔✔-c
*Red Top Cab Company receives multiple complaints per day about driver
behavior. Over 9 days the owner recorded the number of calls to be 3, 0, 8, 9, 6, 7,
4, 9, and 8. What is the upper control limit for the 3-sigma c-chart?*
A) 13.35
B) 8.45
C) 24.00
D) 0.00
E) 9.03 - Answer✔✔-a
Study Guide – Practice
Questions with Verified
Answers. GRADED A+. Latest
2026/2027 Update
*Natural variations: *
A) affect almost every production process.
B) are the many sources of variation that occur when a process is under control.
C) when grouped, form a pattern, or distribution.
D) are tolerated, within limits, when a process is under control.
E) All of the above are true. - Answer✔✔-E) All of the above are true.
*Natural variations:*
A) are variations that are to be identified and investigated.
B) are variations that can be traced to a specific cause.
C) are the same as assignable variations.
D) lead to occasional false findings that processes are out of control.
E) play no role in statistical process control. - Answer✔✔-d
,*Assignable variation:*
A) is a sign that a process is under control.
B) is to be identified and investigated.
C) is the same as random variation.
D) is variation that cannot be traced to a specific cause.
E) leads to a steep OC curve. - Answer✔✔-b
Control charts for variables are based on data that
come from: A) acceptance sampling.
B) individual items.
C) averages of small samples.
D) averages of large samples.
E) the entire lot. - Answer✔✔-c
The purpose of an x-bar chart is to determine whether there has
been a: A) change in the dispersion of the process output.
B) change in the percent defective in a sample.
C) change in the central tendency of the process output.
D) change in the number of defects in a sample.
E) change in the AOQ. - Answer✔✔-c
If a sample of items is taken and the mean of the sample is outside the control
limits, the process is:
,A) likely out of control and the cause should be investigated.
B) in control, but not capable of producing within the established control limits.
C) within the established control limits with only natural causes of variation.
D) monitored closely to see if the next sample mean will also fall outside the
control limits. E) producing high quality products. - Answer✔✔-a
*The causes of variation in statistical process
control are:* A) cycles, trends, seasonality, and
random variations.
B) producer's causes and consumer's causes.
C) mean and range.
D) natural causes and assignable causes.
E) Type I and Type II. - Answer✔✔-d
*The number of defects after a hotel room cleaning (sheets not straight,
smears on mirror, missed debris on carpet, etc) should be measured using
what type of control chart?* A) x-bar chart
B) R-chart
C) p-chart
D) c-chart
E) either x-bar chart or R chart - Answer✔✔-d
, *The number of late insurance claim payouts per 100 should be measured with
what type of control chart?* A) x-bar chart
B) R-chart
C) p-chart
D) c-chart
E) either p-chart or c-chart - Answer✔✔-c
The upper and lower limits for diving ring diameters made by John's Swimming
Co. are 40 and 39 cm., respectively. John took 11 samples with the following
average diameters (39, 39.1, 39.2,
39.3, 39.4, 39.5 39.6, 39.7, 39.8, 39.9, 40). Is the process in
control? A) Yes, no diameters exceeded the control limits.
B) No, some diameters exceeded the control limits.
C) No, there is a distinguishable pattern to the samples.
D) No, the range is not in control.
E) There is not enough information to make a decision. - Answer✔✔-c
*Red Top Cab Company receives multiple complaints per day about driver
behavior. Over 9 days the owner recorded the number of calls to be 3, 0, 8, 9, 6, 7,
4, 9, and 8. What is the upper control limit for the 3-sigma c-chart?*
A) 13.35
B) 8.45
C) 24.00
D) 0.00
E) 9.03 - Answer✔✔-a
