Lecture 8: Testing of proportions
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8 Terms
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Testing of proportions between independent populations
Confidence Interval Approach, Chi-squared test, Fischer’s exact test
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Confidence Interval Approach
Creating a range of values for the difference in two population proportions based on sample data
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True population difference (CI approach)
p1 - p2 (treatment - placebo)
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Standard error of difference of sample proportions
SE(p1-p2)
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Chi-squared Test
Testing equality of two population proportions
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Similarity of CI approach and Chi-squared test
Do not work well for smaller sample sizes
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Fischer’s exact test
Tests equality of two proportions
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Advantages of Fischer’s exact test
No minimum sample size requirement for exact p-value
Note 
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