two-sample_p1-p2_sp08

two-sample_p1-p2_sp08 - Confidence Intervals for Two...

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1 Confidence Intervals for Two Proportions Sections 5.4
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2 Sections 5.4 CI for Two Proportions We are interested in confidence intervals for the difference p 1 – p 2 between the unknown vlaues of two population proportions
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3 5.4 Confidence Intervals for the difference p 1 – p 2 between two population proportions In this section we deal with two populations whose data are qualitative. For nominal data we compare the population proportions of the occurrence of a certain event. Examples Comparing the effectiveness of new drug versus older one Comparing market share before and after advertising campaign Comparing defective rates between two
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Parameter and Statistic Parameter When the data are qualitative, we can only count the occurrences of a certain event in the two populations, and calculate proportions. The parameter we want to estimate is p 1 – p 2 . Statistic
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two-sample_p1-p2_sp08 - Confidence Intervals for Two...

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