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A. Five data entry operators work at the data processing department of the Birmingham Bank. Each day for 30​ days, the number of defective records in a sample of 350 records typed by these operators has been​ noted, as​ follows:                                                                                                                         Sample No. No. Defectives Sample No. No. Defectives Sample No. No. Defectives 1 8 11 7 21 16 2 5 12 5 22 11 3 19 13 15 23 6 4 10 14 3 24 6 5 10 15 12 25 13 6 7 16 7 26 11 7 11 17 12 27 15 8 9 18 3 28 6 9 7 19 18 29 12 10 12 20 16 30 4 ​a) Establish 3σ upper and lower control limits.   UCLp ​= nothing ​(enter your response as a number between 0 and​ 1, rounded to three decimal​ places).

A. Five data entry operators work at the data processing department of the Birmingham Bank. Each day for 30​ days, the number of defective records in a sample of 350 records typed by these operators has been​ noted, as​ follows:                                                                                                                         Sample No. No. Defectives Sample No. No. Defectives Sample No. No. Defectives 1 8 11 7 21 16 2 5 12 5 22 11 3 19 13 15 23 6 4 10 14 3 24 6 5 10 15 12 25 13 6 7 16 7 26 11 7 11 17 12 27 15 8 9 18 3 28 6 9 7 19 18 29 12 10 12 20 16 30 4 ​a) Establish 3σ upper and lower control limits.   UCLp ​= nothing ​(enter your response as a number between 0 and​ 1, rounded to three decimal​ places).

Practical Management Science
Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
Section: Chapter Questions
Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...
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A. Five data entry operators work at the data processing department of the Birmingham Bank. Each day for 30​ days, the number of defective records in a sample of
350
records typed by these operators has been​ noted, as​ follows:
                                                                                                                       
Sample No.
No. Defectives
Sample No.
No. Defectives
Sample No.
No. Defectives
1
8
11
7
21
16
2
5
12
5
22
11
3
19
13
15
23
6
4
10
14
3
24
6
5
10
15
12
25
13
6
7
16
7
26
11
7
11
17
12
27
15
8
9
18
3
28
6
9
7
19
18
29
12
10
12
20
16
30
4
​a) Establish
3σ
upper and lower control limits.
 
UCLp
​=
nothing
​(enter your response as a number between 0 and​ 1, rounded to three decimal​ places).
 
 
 
 
B. Peter​ Ittig's department​ store, Ittig​ Brothers, is​ Amherst's largest independent clothier. The store receives an average of
6
returns per day. Using z​ =
3​,
the control chart limits​ are:
The type of control chart that is best to monitor this process is
▼
 
c minus chartc−chart
x overbar minus chartx−chart
p minus chartp−chart
.
 
 
 
 
C. An ad agency tracks the​ complaints, by week​ received, about the billboards in its​ city:
 
                                                     
Week
No. of Complaints
1
8
 
2
4
 
3
11
 
4
16
 
5
8
 
6
9
 
 
This exercise contains only parts​ a, b, and c.
​a) The type of control chart that is best to monitor this process is
▼
 
p minus chartp−chart
x overbar minus chartx−chart
c minus chartc−chart
.
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