Suppose that the following are the quarterly sales data for the past 7 years. 1.Construct a time...

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Operations Management

Suppose that the following are the quarterly sales data for thepast 7 years.
1.Construct a time series plot and develop linear trend equationusing the original data (with seasonal components).
2.Calculate 4-quarter moving average values for this time series(column E).
3.Calculate centered moving average values and seasonal indexes(column F and G).
4.Calculate seasonal indexes (column J) for the fourquarters.
5.Copy seasonal indexes (column J) to column O, and calculatedeseasonalized number sold (column P).
6.Construct a time series plot and develop linear trend equationusing the deseasonalized data (without seasonal components).
Year
Number Sold
1
35
2
50
3
75
4
90
5
105
6
110
7
130
Year
Quarter
Number
Sold
1
1
6
2
15
3
10
4
4
2
5
10
6
18
7
15
8
7
3
9
14
10
26
11
23
12
12
4
13
19
14
28
15
25
16
18
5
13
22
14
34
15
28
16
21
6
13
24
14
36
15
30
16
20
7
13
28
14
40
15
35
16
27

Answer & Explanation Solved by verified expert

4.2 Ratings (719 Votes)

ComputationsResultYrQtrNumber SoldTrendline to original dataMA4CMASeasonal indicesQtrSeasonal indicesSeasonal indices normalizedSeasonal indices normalizedDeseasonalized dataTrendline to deseasonalized See Answer

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Year	Quarter	Number Sold
1	1	6
2	15
3	10
4	4
2	5	10
6	18
7	15
8	7
3	9	14
10	26
11	23
12	12
4	13	19
14	28
15	25
16	18
5	13	22
14	34
15	28
16	21
6	13	24
14	36
15	30
16	20
7	13	28
14	40
15	35
16	27