There have been complaints that the sports page of the Dubuque Register has lots
ID: 403452 • Letter: T
Question
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 process in control using
Day
Number of Typos
Monday
2
Tuesday
1
Wednesday
5
Thursday
3
Friday
4
Saturday
0
What type of Statistical process Control Charts is appropriate in this case?
Are all points within the control limits? Explain.
What are the 99.73% UCL and LCL for these data?
Would your previous answer change if the limits were set to 95.45%?
Day
Number of Typos
Monday
2
Tuesday
1
Wednesday
5
Thursday
3
Friday
4
Saturday
0
Explanation / Answer
c = 15/6 =2.5
UCl = c + 2.78c^0.5 = 6.895
LCL = c - 2.78c^0.5 = -1.85 (0)
As none of the observations are outside the control limits, the process is in statistical control.
if limits were set to 95.45 % then
UCl = c + 1.69c^0.5 = 4.697
LCL = c - 1.69c^0.5 = 0.303
then it would not be in the contol limits
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.