Section 12.2 Comparing Two Proportions

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Presentation transcript:

Section 12.2 Comparing Two Proportions AP Statistics

Our inferential work so far… Has been about the distribution of sample means and the distribution of the difference of sample means. and the distribution of sample proportions

The sampling distribution of the difference of proportions

The shape of the sampling distribution of difference of proportions If these conditions are met, the sampling distribution of difference of proportions is approximately normal

Two proportion confidence interval

Example A study investigated the effect of pre-school on use of social services. What is the 95% confidence interval? Population Description Sample size Sample proportion 1 Control 61 .803 2 Preschool 62 .613

Calculate the Confidence Interval 1: Populations & Parameter of Interest 3: Calculations 2: Procedure Name & Conditions 4: Interpret

1: Population, Parameter of Interest, H0 and Ha 3: Calculations 2: Procedure Name & Conditions 4: Interpret

1: Population, Parameter of Interest, H0 and Ha 3: Calculations 2: Procedure Name & Conditions 4: Interpret

Assignment Section 12.3: 12.23-12.33 odd Chapter Review: 12.35-12.45 odd