Because the confidence interval ▼ ▼ the pooled sample proportion, the significance level, 0, the critical value, there ▼ does not appear to be appears to be a significant difference between the two proportions. Because the confidence interval consists ▼ of values both less than and greater than only of values greater than only of values less than ▼ the critical value, the significance level, the pooled sample proportion, 0, it appears that the first proportion is ▼ less than greater than not significantly different from the second proportion. There is ▼ sufficient insufficient 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.