4 Questions for Quiz 1 - Data-based Engineering Modeling | ENVE 750, Quizzes of Engineering

Download 4 Questions for Quiz 1 - Data-based Engineering Modeling | ENVE 750 and more Quizzes Engineering in PDF only on Docsity! ENVE 750 Fall 2011 Quiz 1 Name___________________ tn-1 = ū - µ where ū is the sample mean s/(n)1/2 1) Making alpha smaller makes it: a. Easier to reject the null, less burden of proof on the alternative hypothesis b. Harder to reject H0, more burden of proof on the alternative hypothesis 2) A larger alpha makes the associated confidence interval: a. smaller b. larger 3) If the p-value is smaller than alpha, then one: a. rejects the null b. accepts the null c. fails to reject the null 4) What is the symmetric, two-sided 98% confidence interval for the true mean if n=11 samples are taken and an arithmetic mean of 25 and estimated standard deviation of s=5 are obtained? µ = ū +/- s/(n)1/2 tn-1 25 +/- 5 * 2.764/11^0.5 =25+/-4.167 =20.83-29.17 NB: Show formula and values that you plug in.