9_MoreHyp_test - Hypothesis testing and Decision Making...

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Unformatted text preview: Hypothesis testing and Decision Making Formal aspects of hypothesis testing Null and Alternative Hypotheses Null hypothesis (H ) sets the what if for calculating probabilities Alternative hypothesis (H a ) sets the rejection region. Oddly enough, the alternative is usually what you have in mind to prove during the study. 50 : = H 50 : a H : 2 1 =- H : 2 1 - a H Tails The rejection region can fit into 1 or 2 tails of the sampling distribution of means. The RR is determined by the alternative hypothesis. Two Tails One Tail value H = : value H a : value H = : or value H a : value H a < : Tails illustrated value H a : 3 2 1-1-2-3 Z Z Z 1.96-1.96 Don't reject Reject Reject Likely Outcome If Null is True 3 2 1-1-2-3 Z Z Don't reject Reject Likely Outcome If Null is True 1.65 Two tails. One tail. value H a : Note 1.96 vs. 1.65 Example of 2 tails Suppose: Then: 75 : ; 75 : =...
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This note was uploaded on 05/21/2011 for the course PSY 3204 taught by Professor Brannick during the Spring '10 term at University of South Florida - Tampa.

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9_MoreHyp_test - Hypothesis testing and Decision Making...

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