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# Multiple Regression Model

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2. Multiple Regression Model
Suppose a large consumer product company wants to measure the effectiveness of different types of advertising media in the promotion of its products. Specifically, two types of advertising media are to be considered: (1) radio and TV advertising, and (2) newspaper advertising including the cost of discount coupons. A sample of 22 cities with approximately equal populations is selected for study during a test period of 1 month. Each city is allocated a specific expenditure level for both types of advertising. The sales of the product (in thousands of dollars) and also the level of media expenditure during the test month are recorded as follows:

1 0 40 973
2 0 40 1,119
3 25 25 875
4 25 25 625
5 30 30 910
6 30 30 971
7 35 35 931
8 35 35 1,177
9 40 25 882
10 40 25 982
11 45 45 1,628
12 45 45 1,577
13 50 0 1,044
14 50 0 914
15 55 25 1,329
16 55 25 1,330
17 60 30 1,405
18 60 30 1,436
19 65 35 1,521
20 65 35 1,741
21 70 40 1,866
22 70 40 1,717

Using Megastat correlation/regression or MS EXCEL regression function under TOOLS menu, Data Analysis:
1. Find the coefficient of multiple correlation (R) between sales and advertising costs. Interpret the result. [hint: First, enter advertisement and sales data in Excel. Highlight the y-cell range. Highlight all x-cell ranges at once].
2. Find the coefficient of multiple determination (R2). Interpret the result.
3. Predict the average sales for a city in which radio and TV advertising is \$20,000 and newspaper advertising is \$20,000 [use 20 instead of 20,000 in the equation].