Please answer the question below based on a pic I have attached.

The quality of cheese is determined by tasters whose scores are summarized in a dependent variable called Taste. The independent (predictor) variables are three chemicals that are present in the cheese: acetic acid, hydrogen sulfide (H2S), and lactic acid.

Fit a multiple regression model relating Taste to acetic acid, H2S and lactic acid. Is the model valid?

The 15 cases in the data set are given below and also included in Table 4.

\fRegion Annual Sales (5 millions) _Number of Automobiles Registered (5 millions} Regional Personal Income 1_ 52.3 24.5_High 3 23 22.1:Low 3 29.3 7.3 Low 4: 13 12.5:Low 3 3a 3High 3 45.3 11.5_High 3 33 20.3High :3 3.3 4.1:Low 3 33.1 3.3High 13 25.3 5.1_High 11_ 33.3 9.5_High