220B_mid11_answers

220B_mid11_answers - Answer key for the midterm in 2011 1a...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Answer key for the midterm in 2011 1a.) 1 b1 nM 0 y t x t1 b2 0 nF y t x t2 b 1 is exactly equal to the average wage earned by male workers in the sample. b.) s 2 T 21 y t x t1 b 1 x t2 b 2 2 c.) b1 b2 2 b1 b2 2 s 2 n M1 n F1 n M1 0 1 2 11s 0 n F1 1 d.) One could not add a constant term because x 3t 2a.) F m, n b.) 1/m times a 2 x 1t x 2t and X X would not exist. m 3a.) X X 1X y b.) E xtxt 1E xtyt 0 (also correct is 1 c.) X V X 1 X X V X 1 y (also correct is x t / x t1 and element t of y is y t / x t1 XX 1 X y where row t of X is 4a.) XX b s2 T k G 1 1 Xy yt xt b 2 g b gb s2G X X 1 1 G gb m degrees of freedom b.) e2xtxt t S gb m degrees of freedom 1 s2G X X 1 S XX 1 G 1 gb ...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online