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An investment bank is interested in monitoring the weekly amount (in millions of dollars) invested in volatile stocks so as to maintain a stable rate of return on a selected fund. Table shows 25 consecutive weeks of the amount invested ($M) in the fund.
Construct appropriate control charts and comment on the stability of investment. Revise the chart, if necessary, assuming special causes for out-of-control points. What is your estimate of the standard deviation of the weekly amount invested?
Table: Weekly investment in Volatile Stocks
Week
Investment(SM)
1
16.2
10
12.9
19
16.3
2
10.8
11
28.5
20
14.2
3
18.9
12
23.3
21
21.5
4
14.4
13
20.2
22
18.6
5
15.7
14
19.3
23
20.9
6
25.3
15
14.8
24
22.4
7
20.4
16
18.7
25
21.8
8
22.6
17
9
17.8
18
21.2
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