Some printing errors in the lecture note on the F-test have been corrected.

page 7- line5: Replace SS(model) by SS(res). +One sentence added at the end of second bullet point.

page 9: The 4th line in the last bullet point expanded. + A parenthesis added to footnote 4. + Added a footnote 5 to page 9.

page 14:  Added a parenthesis to the first line after the Stata output. + Section 6(i). The alpha and the lambda in the gamma distribution should change Place.