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Question: Consider the following values for the dependent and independent variables:
x y
5 10
15 15
40 25
50 44
60 79
80 112
a. Develop a scatter plot of the data. Does the plot suggest a linear or nonlinear relationship between the dependent and independent variables?
b. Develop an estimated linear regression equation for the data. Is the relationship significant? Test at an α = 0.05 level.
c. Develop a regression equation of the form y^ = b0 + b1x + b2x2 Does this equation provide a better fit to the data than that found in part b?
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