AP statistics

Practice on the 2-Proportion Confidence Interval and the 2-Proportion Significance Test. 1. Suppose a random sample from WCHS found 75 of 100 students were in favor of a national holiday on Election day. Meanwhile, a random sample of 120 RMHS students found 85 of 120 randomly-selected students were in favor of the same thing. Calculate and interpret a 90% confidence interval for the true difference in proportion between the populations of the two schools. 2. Suppose a random sample of 150 cat owners found that 45 of them had microchipped their cats. A random sample of 125 dog owners found that 27 of them had microchipped their dogs. Testing at the 10% level, is there evidence that a higher percentage of cat owners than dog owners have their pets microchipped