10 STAT HWB a - Dr. V.R. Bencivenga Economics 329 PRACTICE...

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Dr. V.R. Bencivenga Economics 329 PRACTICE ASSIGNMENT #10B: RIGHT ANSWERS 1.a   2 X X X i , N iid n ..., , 1 i , X is the probability model for the Beltex population   2 Y Y Y j , N iid n ..., , 1 j , Y is the probability model for the Roadmaster population H 0 : X = Y vs. H A : X Y = .05 15 n n Y X   2 n n Y X t ~ n 1 n 1 s Y X Y X Y X where     2 n n s 1 n s 1 n s Y X 2 Y Y 2 X X 2 since populations are normal 2 2 X 68 . s and 2 2 Y 38 . s     551 . s 3034 . 2 15 15 38 . 14 68 . 14 s 2 2 2 Reject H 0 if 1 cv Y X or if 2 cv Y X . Find cv 1 and cv 2 such that:       412 . cv 048 . 2 15 1 15 1 551 . 0 cv 025 . 048 . 2 t P 025 . 15 1 15 1 551 . 0 cv n 1 n 1 s Y X P 025 . | cv Y X P 1 1 28 1 Y X Y X Y X 1       412 . cv 048 . 2 15 1 15 1 551 . 0 cv 025 . 048 . 2 t P 025 . 15 1 15 1 551 . 0 cv n 1 n 1 s Y X P 025 . | cv Y X P 2 2 28 2 Y X Y X Y X 2 Since 1 cv 65 . 98 . 3 33 . 3 Y X , reject H 0 in favor of H A
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This note was uploaded on 02/26/2012 for the course ECONOMICS 329 taught by Professor Bencivenga during the Spring '12 term at University of Texas.

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10 STAT HWB a - Dr. V.R. Bencivenga Economics 329 PRACTICE...

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