Problem

In the problem, two linear models are given for the data. For the model,(a) find the resid...

In the problem, two linear models are given for the data. For the model,

(a) find the residuals and their sum;


(b) find the sum of the squares of the residuals;


(c) decide which model is the better fit.

Let x = 0 correspond to 1995. Two equations that model the data are y = .12x + 1.1 and y = .lx + 1.3.

Business The weekly amount spent on advertising and the weekly sales revenue of a small store over a five-week period are shown in the following table:

Advertising Expenditure x (in hundreds of dollars)

1

2

3

4

5

Sales Revenue y (in thousands of dollars)

2

2

3

3

5

Two equations that model the data are y = .5x + 1.5 and y = x.

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Solutions For Problems in Chapter 2.3