4. In one recent poll, 475 randomly selected adults in the United States were asked whether they are in favor of the death penalty for a person convicted of murder. Of the 475 adults surveyed, 306 of them said that they would be in favor of the death penalty. (18 pts) (a) What is the sample statistic? (Use appropriate statistic notion) (b) Which formula would you use to construct a 90% confidence interval for the proportion of all adults in the United States who are in favor of the death penalty? (c) Use (b) to find a 90% confidence interval for the proportion of all adults in the United States who are in favor of the death penalty. (Round to 3 decimal places) (b) Interpret this confidence interval in simple language