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The total number of overtime hours (in 1000s) worked in a large steel mill was recorded for 16 quarters, as shown below.
Year
Quarter
Overtime hours
1995
1
32
2
15
3
21
4
28
1996
35
16
27
29
1997
36
25
37
1998
41
31
40
a. Calculate the seasonal indexes based on the data set given above. (Note you need to develop the regression line first).
b. What do the seasonal indexes tell us?
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