STAT 2215Q Study Guide - Comprehensive Final Exam Guide - Variance, Normal Distribution, Test Cricket
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STAT 2215Q Full Course Notes
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Information about exam, and going over practice exam solutions posted on husky ct: there will be a question about boxplots , 3/7 questions will not be computational, no problems regarding welch"s test & f-test. Question 3: we have to use t-test. We can"t use z-test because the degrees of freedom has to be greater than 30. Value: normal cdf (cid:4666)(cid:883). (cid:887),(cid:883)(cid:882)99,(cid:882),(cid:883)(cid:4667) or value: tcdf (cid:4666)(cid:883). (cid:887),(cid:883)(cid:882)99,(cid:885)(cid:887)(cid:4667) Question 7: data set given (12 observations), do tests. Lecture 5: independence, equal variance, normal distribution (cid:1845)(cid:1831)(cid:4666)(cid:1876) (cid:1877) (cid:4667)= (cid:1871)(cid:2869)(cid:2870)(cid:1866)(cid:2869)+(cid:1871)(cid:2870)(cid:2870)(cid:1866)(cid:2870) (cid:1845)(cid:1831)(cid:4666)(cid:1876) (cid:4667)= (cid:3117)(cid:3118)(cid:3041)(cid:3117) (cid:1845)(cid:1831)(cid:4666)(cid:1877) (cid:4667)= (cid:3118)(cid:3118)(cid:3041)(cid:3118) Welch (cid:1846) (cid:1872)(cid:1857)(cid:1871)(cid:1872) when standard deviations of samples are not the same (cid:1872)= (cid:1876) (cid:1877) . T test for equal variance (cid:1876)(cid:2869), . ,(cid:1876)(cid:3041)(cid:3117)~(cid:4666)(cid:2869),(cid:2869)(cid:2870)(cid:4667) (cid:1877)(cid:2869), . ,(cid:1877)(cid:3041)(cid:3118)~((cid:1865)(cid:2870),(cid:2870)(cid:2870)) (cid:3042): (cid:2869)(cid:2870)=(cid:2870)(cid:2870) A procedure (cid:883)5 said to be robust if its valid even when some assumptions are violated: independence. * on exam, she will specify if variance is equal or not.
