Volunteering: The General Social Survey asked 1305 people whether they performed any volunteer work during the past year. A total of 522 people said they did. (a) Find a point estimate for the population proportion of people who performed volunteer work in the past year. Round the answer to at least three decimal places. The point estimate for the proportion of people who performed volunteer work in the past year is El. (b) Construct a 95% condence interval for the proportion of people who performed volunteer work in the past year. Round the answers to at least three decimal places. A 95% condence interval for the proportion of people who performed volunteer work in the past year is D