E Homework: Secti... Question 7, 7.1.15 HW Score: 56%, 8.4 of 15 points O Part 1 of 4 O Points: 0 of 1 Save Use the sample data and confidence level given below to complete parts (a) through (d). In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed to 2579 subjects randomly selected from an online group involved with ears. 1143 surveys were returned. Construct a 99% confidence interval for the proportion of returned surveys. Click the icon to view a table of z scores. a) Find the best point estimate of the population proportion p. (Round to three decimal places as needed.)