Using the data in Solved Problem 4.7, find the coefficient of determination, r2, for the model.

Data From Problem 4.7

Cengiz Haksever runs an Istanbul high-end jewelry shop. He  advertises weekly in local Turkish newspapers and is thinking  of increasing his ad budget. Before doing so, he decides  to evaluate the past effectiveness of these ads. Five weeks  are sampled, and the data are shown in the table below:

Develop a regression model to help Cengiz evaluate his advertising.

Transcribed Image Text:

SALES ($1,000s) 11 AD BUDGET THAT WEEK ($100s) 5 6 3 10 7 6 2 12 8