Wd a quadratic term on fertilizer and

Question

Fertilizer	Yield
0	6
0	9
20	19
20	24
40	32
40	38
60	46
60	50
80	48
80	54
100	52
100	58

1. When applied a quadratic term on fertilizer and performed the quadratic regression analysis, what is b₂?

a) 6.6429 

b) 0.8950

c) -0.00407

2. Is the curvilinear effect significant?

a) Yes

b) No

c) Not enough information to determine

3. Predict the average yield of tomatoes (in pounds) for a plot that has been fertilized with 70 pounds per 1,000 square feet.

a) 89.393 

b) 69.293

c) 49.203 

4. When performed a natural logarithm transformation of the response variable (yield), what is b₁?

a) 2.475

b) 0.01855

c) 0.2475

5. When performed a residual analysis of the results, does the model fit the data adequately?

a) Yes

b) No

c) Not enough information to determine

6. When performed a square-root transformation of the explanatory variable (fertilizer), what is b₁?

a) 4.66613

b) 0.56853

c) 5.06852

7. Compare this model (square-root) with the natural logarithm model, which model would you choose?

a) Logarithm model

b) Square-root model

c) No difference in their results