In a survey of 3325 adults aged 57 through 85 years, it was found that 81.5% of them used at least one prescription medication. Complete parts (a) through (c) below. a. How many of the 3325 subjects used at least one prescription medication? El (Round to the nearest integer as needed.) Use the sample data and condence level given below to complete parts (a) through (d). A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll, n = 964 and x = 507 who said "yes." Use a 95% condence level. a Click the icon to View a table of z scores. 3) Find the best point estimate of the population proportion p. 0.526 (Round to three decimal places as needed.) b) Identify the value of the margin of error E. E=D (Round to three decimal places as needed.)