Problem 4: A company wants to test the effectiveness of their product advertising. It provides different marketing strategies in 10 regions. The following table contains advertising expenses (x in millions of dollars) and the number of sales (y in millions of units). x: 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 y: 37.5 38.4 38.6 39 41.8 41.2 44.3 45.5 46.6 48.2 (a) Fit the linear regression model by least squares. (b) Calculate R^2 for this model. (c) Estimate σ^2 for this model.
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75 / 20.625 beta1 = 2.467 Show more…
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