. Fitting a multiple regression using 20 observations gave the following results:

Dependent Variable: Y

R-Square Root MSE Y Mean

0.993733 0.434604 6.335000

Source DF Type I SS Type III SS

x1 1 270.5529453 2.16717818

x2 1 143.6314628 2.21046747

x3 1 31.2677868 26.08887272

x4 1 3.8000902 3.80009024

Parameter

Estimate Standard Error

Intercept 0.475 0.45845003

x1 -.578 0.17068791

x2 0.009 0.00265354

x3 0.007 0.00061762

x4 0.087 0.01933796

Is there significant evidence that b₃>0 at =0.05?

1. Give a 90% confidence interval for b₂. Interpret your result