The first-order model y = Po + Plxl + P2x2 + E was fit to n = 19 data points with the results shown in the SAS printout provided below.

a. Find R2 and interpret its value.

b. Find Ri and interpret its value.

c. Test the null hypothesis that P, = P2 = 0 against the alternative hypotheyis that at least one of P, and p2 is nonzero. Calculate the test statistic using the two formulas given in this section, and compare your results to each other and to that given on the printout. Use a = .05 and interpret the result of your test.

d. Find the observed significance level for this test on the printout and interpret it.