SOLUTIONMBA5008W3A3 - 8.42 a P(X > 12,000 = = P(Z >.83 = 1...

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8.42 a P(X > 12,000) = = P(Z > .83) = 1 – P(Z < .83) = 1 – .7967 = .2033 b P(X < 9,000) = = P(Z < –.42) = .3372 13.5 a Equal-variances t-test degrees of freedom = 28, Unequal-variances t-test degrees of freedom =26.4 b Equal-variances t-test degrees of freedom = 24, Unequal-variances t-test degrees of freedom = 10.7 c Equal-variances t-test degrees of freedom = 98 , Unequal-variances t-test degrees of freedom = 91.2 d Equal-variances t-test degrees of freedom = 103, Unequal-variances t-test degrees of freedom = 78.5 -------------------------------------------- 13.8 = 0 0 a Unequal-variances test statistic = 200.4 (rounded to 200) Rejection region: = = .62, p-value = .2689. There is not enough evidence to infer that is greater than. b Unequal-variances test statistic = 223.1 (rounded to 223) Rejection region: = = 2.46, p-value = .0074. There is enough evidence to infer that is greater than. c The value of the test statistic increases and the p-value decreases.
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This note was uploaded on 03/11/2012 for the course MBA eco 5008 taught by Professor Smith during the Fall '12 term at University of Phoenix.

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SOLUTIONMBA5008W3A3 - 8.42 a P(X > 12,000 = = P(Z >.83 = 1...

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