Calculate the seasonal indexes , Applied Statistics

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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	1	35
	2	16
	3	27
	4	29
1997	1	36
	2	21
	3	25
	4	37
1998	1	41
	2	29
	3	31
	4	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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