s2000exam1solbd

s2000exam1solbd - Spring 2000 Exam 1 Solutions MSCI3710 No...

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Spring 2000 Exam 1 Solutions MSCI3710 No. Solution Version B Version D 1 The correct set of hypothesis for this test is Ho: Φ = 250 Ha: Φ 250 C B 2 Even though the sample size is less than 100, we use Z because the population standard deviation is known C D 3 Look p. 488 for the equation Z = (X- μ )/( σ / n), (246-250)/(13/ 35) = -1.82 Variance is 169, so the standard deviation is 13 D A 4 Critical value is –2.33 and the test statistic is – 2.00. Therefore, Fail to reject the null hypothesis, conclude there is insufficient evidence the boards are too long or too short. A B 5 Look p. 540 for the equation S 2 p = ((n 1 –1)S 2 1 + (N 2 –1)S 2 2 )/((n 1 -1)+(n 2 -1)) ((26-1)1.45 2 + (23-1)1.95 2 )/((26-1)+(23-1)) = 2.90 B D 6 Look under the t table (Appendix E-7) for degrees of freedom of 47 (26-1+23-1) then look under 0.05 significance level (it is a two tail test). The answer is 1.68. A

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s2000exam1solbd - Spring 2000 Exam 1 Solutions MSCI3710 No...

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