Management of a home appliance store would like to understand the growth pattern of the monthly sales of Blu- ray disc players over the past two years. Managers have recorded the relevant data in the file P10_ 09. xlsx.
a. Create a scatterplot for these data. Comment on the observed behavior of monthly sales at this store over time.
b. Estimate an appropriate regression equation to explain the variation of monthly sales over the given time period. Interpret the estimated regression coefficients.
c. Analyze the estimated equation’s residuals. Do they suggest that the regression equation is adequate? If not, return to part b and revise your equation. Continue to revise the equation until the results are satisfactory.
>Source
This is fictitious data. 2
0 56
00
66
1
Data
Month
Blu-ray disc players sold
1
2
3
2
1
5
6
3
330
4
4
8
5
12
9
6
1
7
7
20
8
2512
9
23
10
2942
11
2872
12
2937
13
3136
14
3
24
15
3149
16
3524
17
3542
18
3312
19
3547
20
3376
21
3375
22
3403
23
3697
24
3495
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