HypothesisTesting_Sp08IIIBB_nocolor - Steps for Hypothesis...

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1 Hypothesis Testing Steps for Hypothesis Testing 1. H 1 and H 0 2. Determining the nature of the dependent variable 3. Choosing the appropriate test statistic 5. Determining sample size 6. Collecting data 7. Conducting appropriate statistical tests 8. Calculate observed effect sizes 9. Decision Making Step 5: Determining Sample Size Why is this important? 1. Practical significance 2. More formulaic research design 3. Future comparisons 4. Effect Size post comparison: the extent to which the IV had an effect of separating the two populations −∞ H 0 H 1
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−∞ M inimum E ffect of I nterest H 1 H 0 Step 5: Determining Sample Size • Minimum Effect of Interest: smallest effect size important – usually based on past research or a “medium” level • Effect Size: “practicality” of your finding ; magnitude d -family: differences between groups or levels of the IV. r -family: correlation coefficient between two independent variables • Already dealt with Pearson’s r (magnitude + direction!) Step 5: Determining Sample Size • Power: the probability of detecting your minimum effect of interest – too much or too little is a problem
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This note was uploaded on 04/07/2008 for the course PSY 031 taught by Professor Dicorcia during the Spring '08 term at Tufts.

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HypothesisTesting_Sp08IIIBB_nocolor - Steps for Hypothesis...

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