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= 1040 and x= 556 who said "yes." Use a 95% confidence level. E Click the icon to view a table of z scores. a) Find the best point estimate of the population proportion p. 535 (Round to three decimal places as needed.) b) Identify the value of the margin of error E. E= 030 (Round to three decimal places as needed.) c) Construct the confidence interval.

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