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9.9: Introduction to Estimate the Difference Between Population Proportions

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  • What you’ll learn to do: Construct and interpret confidence intervals to compare two population/treatment group proportions.

    A sample distribution with confidence intervals marked and the respective critical z-score for each confidence level. Confidence levels with higher percentage values cover more of the sample distribution and have a higher critical z-score.In this section we will learn to construct a confidence interval to estimate the difference between two population proportions (or the size of a treat-ment effect) when conditions are met. We will then interpret the meaning of a confidence level associated with a confidence interval. This is important when we describe how the confidence level affects the margin of error. We will then evaluate whether conclusions are reasonable when given the description of a statistical study.

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