Use the sample data and condence level given below to complete parts (a) through (d). l|\\ In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed to 2311 subjects randomly selected from an online group involved with ears. 916 surveys were returned. Construct a 99% condence interval for the proportion of returned surveys. a Click the icon to view a table of z scores. a) Find the best point estimate of the population proportion p. 3 (Round to three decimal places as needed.)