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Unformatted text preview: PSTAT 120B  Probability & Statistics Class # 083 Pvalues Jarad Niemi University of California, Santa Barbara 21 May 2010 Jarad Niemi (UCSB) Pvalues 21 May 2010 1 / 15 Class overview Announcements Announcements Homework Homework 6 due Monday, 24 May @ 4pm in SH 5521 Wont be returned until Friday 28 May Midterm II #6 was incorrect in the answer key, so if you have answer c and have it marked incorrect, see me. Jarad Niemi (UCSB) Pvalues 21 May 2010 2 / 15 Class overview Goals Pvalues Practical versus statistical significance Jarad Niemi (UCSB) Pvalues 21 May 2010 3 / 15 Review Problems In hypothesis testing, is the probability of committing an error of Type II. The power of the test, 1 is then: the probability of (a) rejecting H when H a is true (b) failing to reject H when H a is true (c) rejecting H when H a is false (d) failing to reject H when H a is false Is power an error? No Which of the above are errors? b,c Since =P(not rejecting H when H a is true) then power 1 =P(rejecting H when H a is true), so the answer is (a) Jarad Niemi (UCSB) Pvalues 21 May 2010 4 / 15 Review Problems If I run an 0.05level test and fail to reject the null hypothesis which of the following is true about a 0.01level test using the same data and hypothesis? (a) the null hypothesis will be rejected (b) the null hypothesis will not be rejected (c) not enough information As gets smaller, the rejection region gets smaller. Therefore it will be harder to reject. So (b) is the answer....
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This note was uploaded on 01/10/2011 for the course STAT 120B taught by Professor Bennett during the Fall '09 term at UCSB.
 Fall '09
 Bennett
 Statistics, PValues, Probability

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