DAY AVERAGE (Ib) DAY AVERAGE (Ib) 16.3 13 16.3 2 15.9 14 15.9 3 15.8 15 16.3 4 15.5 16 16.2 5 16.3 17 16.1 16.2 18 15.9 7 16.0 19 16.2 8 16.1 20 15.9 15.9 21 15.9 10 16.2 22 16.0 11 15.9 23 15.5 12 15.9 24 15.8

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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Question

A. Choudhury’s bowling ball factory in Illinois makes

bowling balls of adult size and weight only. The standard devia-
tion in the weight of a bowling ball produced at the factory is

known to be 0.12 pounds. Each day for 24 days, the average
weight, in pounds, of nine of the bowling balls produced that day
has been assessed as follows:

 a) Establish a control chart for monitoring the average weights

of the bowling balls in which the upper and lower control lim-
its are each two standard deviations from the mean. What are

the values of the control limits?
b) If three standard deviations are used in the chart, how do these
values change? Why?

DAY
AVERAGE (Ib)
DAY
AVERAGE (Ib)
16.3
13
16.3
2
15.9
14
15.9
3
15.8
15
16.3
4
15.5
16
16.2
5
16.3
17
16.1
16.2
18
15.9
7
16.0
19
16.2
8
16.1
20
15.9
15.9
21
15.9
10
16.2
22
16.0
11
15.9
23
15.5
12
15.9
24
15.8
Transcribed Image Text:DAY AVERAGE (Ib) DAY AVERAGE (Ib) 16.3 13 16.3 2 15.9 14 15.9 3 15.8 15 16.3 4 15.5 16 16.2 5 16.3 17 16.1 16.2 18 15.9 7 16.0 19 16.2 8 16.1 20 15.9 15.9 21 15.9 10 16.2 22 16.0 11 15.9 23 15.5 12 15.9 24 15.8
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