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Researchers at Miami University in Oxford, Ohio, investigated the use of p charts Ohio to monitor the market share of a product and to document the effectiveness of marketing share of a product and to document the effectiveness of marketing promotions. Marketing share is defined as the company's proportion of the total number of products sold in a category. If a p chart based on a company's market share indicates an incontrol process, then the company's share in the market-place is deemed to be stable and consistent over time. In the example givenin the article, the RudyBird Disk Company collected daily sales data from a nationwide retail audit service. The first 30 days of data in the accompanying table below indicate te total number of cases of computer disks sold and the number of RudyBird disks sold. The final 7 days of data were taken after RudyBird launched a major in-store promotion. A control chart was used to see if the in-store promotion would result in special cause variation in the marketplace.
a. Construct a p chart using data from the first 30 days (prior to the promotion) to monitor the market share for RudyBird Disks.
b. Is the market share for RudyBird in control before the start of the in-store promotion?
c. On your control chart, extend the control limits generated in (b) and plot the proportions for days 31 through 37. What effect, if an, did the in-store promotion have on RudyBird's market share?
Cases Sold Before the Promotion
Day
Total Cases
RudyBird
1
154
35
2
153
43
3
200
44
4
197
56
5
194
54
6
172
38
7
190
8
209
62
9
173
53
10
171
39
11
12
168
37
13
184
45
14
211
58
15
179
16
177
17
143
18
69
19
134
20
192
47
21
155
22
135
36
23
189
55
24
25
170
26
178
48
27
167
42
28
204
71
29
183
64
30
169
Cases Sold After the Promotion
Total
31
201
92
32
76
33
205
85
34
199
90
187
77
79
198
97
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