Question

A collection of paired data consists of the number of pounds of fertilizer (x) spread in a field and the amount of wheat (y) produced in that field. Fertilizer data ranged from 20 lb. to 85 lb. sample mean amount of fertilizer = 60 lb., sample mean amount of wheat produced = 23 (hundred) lb. Excel returns the following regression analysis.        

Regression Statistics
Multiple R	0.865
R Square	0.748
ANOVA
	df	SS
Regression	1	749.067
Residual	10	186.933
Total	11	936.000
	Coefficients	Standard Error
Intercept	-0.245	3.574
pd. of fertilizer	0.326	0.056

a. Determine if there is a significant linear relationship between the variables by the rho test.

b. Write the regression equation.

c. What percent of variation in amount of wheat produced cannot be explained by the regression equation?

d. What is the best predicted value of the amount of wheat produced if the amount of fertilizer is 90 pounds?

Answer 1