Exam1Sol.SuII04C - Solutions MSCI 3710 Summer II 2004 Exam...

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Solutions MSCI 3710 Summer II 2004 Exam 1 – C No. Solution Version C 1 The appropriate alternative hypothesis is μ < 31.5, ref: Table E 2 Reject Ho if t* is < -2.54, ref: Table D 3 The calculated value of the test statistic is -1.31, ref: Table B 4 The decision and conclusion of the test: F.T.R. Ho, conclude there is insufficient evidence that the cars under perform the manufacturer’s mpg rating. B 5 The alternative hypothesis for this test Ha: μ > 18, (high ) B 6 The appropriate test statistic used here is Z, (σ = 2, given) C 7 At the 5% level of significance, Reject Ho in the region > 1.645 A 8 Reject the null hypothesis, conclude there is evidence the company’s hourly wage is higher compared with the industry average. B 9 The sample mean difference in heights between the two teams is 5. ( 81.8-76.8) C 10 The calculated value of the test statistic is 2.34, (ref: Table) B 11 Computed t-stat is 6.3 (>3.355). p-value < 0.01 is the choice A 12 If there is variation in usage of shoes from user to user, the proper test to be followed up, in this case is paired t-test A 13
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