To compare the means of two populations, independent random samples of 144 observations are selected from each population with the following results. Sample 1 Sample 2 1 = 7,123 2 = 6,957 s1 = 175 s2 = 225 Use a 95% confidence interval to estimate the difference between the population means. Interpret the confidence interval.

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Q: Construct a 98% confidence interval for the difference between the population proportions.

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A: GivenUVA(pop 1): n1=87      p1^=0.737UNC(pop 2): n2=100   p2^=0.56α=1-0.937=0.063α2=0.0315zα2=1.8592

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