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Psyc_315_-_Winter_2010_-_Class_24_-_Final_Review

Psyc_315_-_Winter_2010_-_Class_24_-_Final_Review - Review...

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1 Review for Final Exam 2 Steps of Hypothesis testing for major procedures Test: Step 1: Step 2: Step 3: Step 4: Step 5: C.I. Z Test Null and Alt. Hypothesis Get N, M, M P , SD M Calc. z-statistic (M-M P )/SD M Calc. z-critical cutoff at given α Retain or reject null M±Z a S M t-test (one sample) Null and Alt. Hypothesis Get df, M, Mp, S M Calc. t-statistic (M-M P )/S M Calc. t-critical cutoff at given α Retain or reject null M±t α S M t-test table t-test (two sample) INDEPENDENT Null and Alt. Hypothesis Get df, M 1 , M 2 , S M Diff Calc. t-statistic (M 1 -M 2 )/S M Difference Calc. t-critical cutoff at given α Retain or reject null (M 1 -M 2 )±t α S M Diff . t-test (two sample) DEPENDENT Null and Alt. Hypothesis Get Df, D, M D , S M Calc. t-statistic M D /S M Calc. t-critical cutoff at given α Retain or reject null M D ±t α S M normal table 3 5 Steps of Hypothesis Testing 1. Restate the question as a research hypothesis and a null hypothesis about the populations. 2. Determine the characteristics of the sampling distribution. 3. Determine the level of significance ( α ), and the cut-off sample score on the sampling distribution at which the null hypothesis should be rejected. 4. Determine your sample’s score on the sampling distribution. 5. Decide whether to reject or retain the null hypothesis . State what that means.

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2 4 For each of the following studies, say whether you would use a t test for a single sample, t test for dependent means, or a t test for independent means. (a) A psychology researcher randomly assigns a group of 50 high school students to receive a new assertiveness training program and 45 other high school students to receive the standard after-school program that focuses on social skills. She later measures how well each group performs on a measure of interpersonal assertiveness. (b) An advertising firm measures 100 consumer reports about their favourite brand of soda before and after a major ad campaign is launched on television and in the local newspapers. (c) The coach of his football team conducts an informal survey showing that members of the team study an average of 3.5 hours per day. The coach makes the claim that this is equivalent to the amount of time students at the college study in general. You feel that the coach is incorrect. You randomly select 50 students from the college and ask them how much they study each day. Your result is that these 50 students study an average of 5.2 hours per day.
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Psyc_315_-_Winter_2010_-_Class_24_-_Final_Review - Review...

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