Consider the following data for two variables, x and y.

a. Develop an estimated regression equation for the data of the form y-bar = b0 + b1x.
b. Use the results from part (a) to test for a significant relationship between x and y.
Use α = .05.
c. Develop a scatter diagram for the data. Does the scatter diagram suggest an estimated regression equation of the form yˆ = b0 + b1x + b2x2? Explain.
d. Develop an estimated regression equation for the data of the form y-bar = b0 + b1x +
b2x2.
e. Refer to part (d). Is the relationship between x, x2, and y significant? Use α = .05.
f. Predict the value of y when x = 25.

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