Problem 1:
Twentyfive engine mounts are sampled each day and found to have an average width of 2 inches,
with a standard deviation of 0.1 inches. What are the control limits that include 99.73% of the
sample means
(
3)?
Z
=
Problem 2:
Several samples of size
8
n
=
have been taken from today’s production of fence posts. The average
post was 3 yards in length and the average sample range was 0.015 yard. Find the 99.73% upper
and lower control limits.
Problem 3:
The average range of a process is 10 lbs. The sample size is 10. Use Table S6.1 to develop upper
and lower control limits on the
range
.
Problem 4:
Based on samples of 20 IRS auditors, each handling 100 files, we find that the total number of
mistakes in handling files is 220. Find the 95.45% upper and lower control limits.
Problem 5:
There have been complaints that the sports page of the Dubuque Register has lots of typos. The last
6 days have been examined carefully and the number of typos/page is recorded below. Is the
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 Fall '05
 RobShepherd
 Standard Deviation, Mean, Weekday names, Process capability

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