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Test: Week 3... Question 7 of 20 This test: 100 point(s) possible This question: 5 point(s) possible Submit test Use the sample data and confidence 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 = 1074 and x = 549 who said "yes." Use a 90% confidence level. 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.) b) Identify the value of the margin of error E. E = (Round to three decimal places as needed.) c) Construct the confidence interval.