Using Confidence Intervals a. Assume that we want to use a 0.05 significance level to test the claim that P1 b. In general, when dealing with inferences for two population proportions, which two of the following are equivalent: confidence interval method; P-value method; critical value method?
c. If we want to use a 0.05 significance level to test the claim that P1 d. If we test the claim in part (c) using the sample data in Exercise 1, we get this confidence interval: â0.000508 Because the confidence interval does not contain contains 0, the significance level, the critical value, the pooled sample proportion, there does not appear to be appears to be a significant difference between the two proportions. Because the confidence interval consists only of values greater than of values both less than and greater than only of values less than the significance level, the critical value, the pooled sample proportion, 0, it appears that the first proportion is not significantly different from less than greater than the second proportion. There is insufficient sufficient evidence to support the claim that the rate of polio is less for children given the vaccine than it is for children given a placebo.