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Telephone Survey Wichita Before Ad After Ad Drove after 4 drinks 71 61 Others 134 160 205 221 Analyzed Category Proportion of Items in This Category Drove after 4 drinks Before Ad After Ad Sample Summaries Data Set #3 Data Set #3 Sample Size 205 221 Sample Proportion 0.346 0.276 Hypothesis Test (Difference Between Proportions) Pooled Proportion 0.310 Difference Between Proportions 0.070 Hypothesized Difference 0 Alternative Hypothesis > 0 Standard Error of Difference 0.045 Test Statistic 1.5683 p-Value 0.0584 Null Hypoth. at 10% Significance Reject Null Hypoth. at 5% Significance Don't Reject Null Hypoth. at 1% Significance Don't Reject
