Examine the following two sets of data:

a. Produce a distinguishable scatter plot for each of the data sets on the same graph. Does it appear that there is interaction between x2 and the relationship between y and x1? Support your assertions.
b. Consider the following model to represent the relationship among y, x1, and x2:

Produce the estimated regression equation for this model.
c. Conduct a test of hypothesis for each interaction term. Use a significance level of 0.05 and the p -value approach.
d. Based on the two hypothesis tests in part c, does it appear that there is interaction between 2 and the relationship between y and x1? Support your assertions.