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Exercise on Multiple Regression Analysis of Detergent Demand Follow these instructions to complete this multiple regression assignment to forecast the sales (= demand) of detergent

Exercise on Multiple Regression Analysis of Detergent Demand

Follow these instructions to complete this multiple regression assignment to forecast the sales (= demand) of detergent cases.

1. Using the 30-week time series data in the table below, create a new Excel data file and do regression analysis in Excel on the data consisting of dependent variable Q and independent variables P, Px, A, and I.

Q = Detergent demand in cases; P = Price per case; Px = Competitor price; A = Advertising expenses; I = Household income.

Week Q P Px A I
1 1,290 137 94 814 53,123
2 1,177 147 81 896 51,749
3 1,155 149 89 852 49,881
4 1,299 117 92 854 43,589
5 1,166 135 86 810 42,799
6 1,186 143 79 768 55,565
7 1,293 113 91 978 37,959
8 1,322 111 82 821 47,196
9 1,338 109 81 843 50,163
10 1,160 129 82 849 39,080
11 1,293 124 91 797 43,263
12 1,413 117 76 988 51,291
13 1,299 106 90 914 38,343
14 1,238 135 88 913 39,473
15 1,467 117 99 867 51,501
16 1,089 147 76 785 37,809
17 1,203 124 83 817 41,471
18 1,474 103 98 846 46,663
19 1,235 140 78 768 55,839
20 1,367 115 83 856 47,438
21 1,310 119 76 771 54,348
22 1,331 138 100 947 45,066
23 1,293 122 90 831 44,166
24 1,437 105 86 905 55,380
25 1,165 145 96 996 38,656
26 1,328 138 97 929 46,084
27 1,515 116 97 1,000 52,249
28 1,223 148 84 951 50,855
29 1,293 134 88 848 54,546
30 1,215 127 87 891 38,085

5. Characterize (explain) the overall explanatory power of this multiple regression model in light of the R squared. (You will need to do an online search to learn about the meaning and importance of "R" to explain the model).

6. Applying your final model in forecasting: Use your regression model to forecast weekly detergent demand (Q) in the company's five new markets (A through E) based on the following expected data for the independent variables:

Regional independent variable forecast for the following period (week 31) P Px A I FORECAST OF WEEKLY DEMAND OF DETERGENT (Q)
Market A 115 90 790 41,234 ?
Market B 122 101 812 39,845 ?
Market C 116 87 905 47,543 ?
Market D 140 82 778 53,560 ?
Market E 133 79 996 39,870 ?

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