In studying his campaign plans, Mr. Singleton wishes to estimate the difference between younger voters and older voters views regarding his appeal as a candidate. He asks his campaign manager to take two random independent samples and find the 90% confidence interval for the difference. A random sample of 619 voters age 35 and under and 742 voters over age 35 was taken. 310 voters age 35 and under and 461 voters over age 35 favored Mr. Singleton as a candidate. Find this confidence interval. Step 1 of 3: Find the point estimate that should be used in constructing the confidence interval. Round your answer to three decimal places.