STAT 2507A &acirc;€“ August 5

# STAT 2507A &acirc;€“ August 5 - STAT2507AAugust5...

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1 STAT 2507A – August 5 Jerry Situ 10.4-10.7 Summer 2009

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Final Exam 10 Multiple Choice (20 points – 2 per question) 40% pre-midterm 60% post-midterm 10 Long answer with multiple parts (80 points – 8 per  question) 20% pre-midterm 80% post-midterm Formula sheet provided (sample posted) You must show your work.
Exercise If p-value > alpha then: a) Reject the null, and accept the alternate  hypothesis b) Accept the null hypothesis c) Do not reject the null hypothesis. 3

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Difference between two independent  samples (small sample) Recall large sample (by CLT): For small samples (CLT does not apply): What is the distribution of the standardized statistics? What is the estimate for  σ ? 4
Difference between two independent  samples (small sample) If the two sampled population is normal, then    is exactly N(0,1) (same as in chap 9) However, if we estimate the standard error like before  with s 1  and s 2 , it is not longer Z, and it is not even a t- dist. Need to assume that the population variances are equal  ( σ 1 = σ 2 ).

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