A short exam
1.
is the symbol for
a) the average
b) the average of averages
c) the standard deviation
d) the median
e) none of the above
2. The range of the following data:
4, 3, 6, 4, 8, 2, 9, 5, 6, 4
a) 10
b) 9
c) 7
d) 2
e) none of the above
3. In random sampling
a) samples are picked visually, some here, some there
b) every other sample is picked
c) samples are picked randomly in the judgment of the operator
d) samples are picked using random number tables
e) none of the above
4. Calculate the upper control limit using the formula below.
The sample size is 4, the average range is 6.20, and 35.1 is the
grand average.
Upper control limit: 
= 
Subgroup size
|
A2
|
D3
|
D4
|
d2
|
| 2 |
1.880 |
0 |
3.268 |
1.128 |
| 3 |
1.022 |
0 |
2.574 |
1.693 |
| 4 |
0.730 |
0 |
2.282 |
2.059 |
| 5 |
0.577 |
0 |
2.114 |
2.326 |
a) 39.63
b) 46.76
c) 30.57
d) 158.86
e) none of the above
5. Which of the following does not represent an out of control
condition?
a) a point inside the control limits
b) a point outside the control limits
c) a run of 7 points above the grand average
d) a nonrandom pattern
e) a run of 7 points all going up
6. The process mean is midway between the specification limits
and the specification limits are greater than 3 standard deviations
away from the mean. This is an example of
a) the detection system
b) a cause-and-effect diagram
c) a capability analysis
d) a control chart
e) none of the above
7. For an x-bar R chart, about how many samples must be obtained
before control limits can be calculated?
a) at least 1
b) 3, 4, or 5
c) about 30
d) over 100
e) none of the above
8. Which one of the following is not usually part of a control
chart?
a) sample averages
b) date and time
c) notes about conditions or changes
d) specification limits
e) none of the above
9. Before capability can be determined the process
a) must be in statistical control
b) must have a histogram
c) must have a control chart
d) must be restarted
e) none of the above
10. Standard deviation is a measure of
a) the location of the data
b) the variability of the data
c) the skewness of the data
d) the normality of the average
e) none of the above
Exam answers