Question: A sample survey is designed to estimate the proportion of sports utility vehicles and minivans being driven in the state of California. A random sample of 500 registrations is selected from a DMV database. 68 are classified as sports utility vehicles. A second random sample of 600 registrations is selected, and 84 are classified as minivans. Is there evidence to suggest a difference in the proportion of sports utility vehicles and the proportion of minivans in California, with a significance level of 0.025? Justify your answer.