BA 3301 Lecture Notes - Lecture 80: And1
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2 i=1 i 2 n 1+n 1. The t stat , for 1 - 2 with 1 and 2 unknown and assumed equal, is: tst at = s ( + ) (x x ) ( ) The confidence interval, for 1 - 2 with 1 and 2 unknown and assumed equal, is: ( 1 x2 t /2 s ( What can you conclude? (f) form a 95% confidence interval for the population mean of the samples (i. e. 1 - 2 ). (g) what assumptions are you making? (a) h 0 : 1 = 2. Zst at = (p p ) ( ) Confidence interval for (cid:551) 1 - (cid:551) 2 : ( 1 p2 z /2 n1 p p (1 p ) Covariance and correlation once again, remember we assume (cid:551) 1 = (cid:551) 2 . n i=1 (x x)(y y ) i i http://ci. columbia. edu/ci/premba_test/c0331/s7/s7_5. html.
