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# Effect size presentation.rob

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Dr. Core

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### Effect size presentation.rob

1. 1. Effect Size<br />EDL 204<br />
2. 2. Start with Hypothesis Testing<br />You go through the 6 steps of Hypothesis Testing and get a significant result<br />So what?<br />The probability of obtaining a significant result is highly correlated with the size of the sample<br />More numbers = increase probability of significance<br />Sometimes the impact is meaningless<br />
3. 3. Significance<br />Statistical Significance<br />Reached a result that has a probability of less than 5% that it is due to error<br />Practical Significance<br />Looks at whether the difference is useful in the real world<br />http://www.youtube.com/watch?v=rOyK_K0SOaU<br />
4. 4. Effect Size<br />d = Cohens Effect Size<br />μ1 = Mean of Group 1<br />μ2 = Mean of Group 2<br />σ = Standard Deviation<br />
5. 5. Effect Size<br />Results in a measure of standard deviation<br />Can be interpreted as noted by Cohen on the left<br />A large effect size would mean there would be a large impact on the population<br />
6. 6. Effect Size<br />Used to compare studies <br />Can have different<br />Methods<br />Statistics<br />Metrics<br />Only measuring the difference in mean 1 and mean 2 divided by SD<br />
7. 7. Visible Learning<br />Meta Analysis of 800 Meta Analyses <br />Summary of many articles on the topic<br />Uses Effect Sizes<br />1 effect size = 1 standard deviation<br />1 standard deviation = 2 years increase<br />Cohen said “Blatantly obvious”<br />PhD Students vs High School Students on IQ<br />
8. 8. Visible Learning<br />Distribution of Effect Sizes, Chapter 2, pg 16<br />Most have a positive effect<br />Doing almost anything increases achievement<br />Set the bar at d = 0.40<br />Average of all effect sizes<br />This is not just placing a teacher in front of a room<br />Benchmark to notice real differences<br />
9. 9. Visible Learning<br />Typical Effect Size<br />.40<br />0<br />Enhanced<br />Zero<br />Decreased<br />
10. 10. Visible Learning<br />We want...<br />.40<br />0<br />Enhanced<br />Zero<br />Decreased<br />
11. 11. Visible Learning<br />.40<br />.30<br />.50<br />.10<br />.20<br />.60<br />Typical<br />Teacher<br />Effects<br />.70<br />Zone of Desired Effects<br />Developmental Effects<br />.80<br />0<br />.90<br />Reverse Effects<br />1.0<br />
12. 12. Visible Learning<br />.40<br />.30<br />.50<br />.10<br />.20<br />.60<br />Typical<br />Teacher<br />Effects<br />.70<br />Zone of Desired Effects<br />Developmental Effects<br />.80<br />0<br />.90<br />Reverse Effects<br />1.0<br />Microteaching d = .88 <br />pg 112-113<br />