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=956 and x=519 who said​ "yes." Use a 90% confidence level. The best point estimated of population proportion p = 0.543     ​b) Identify the value of the margin of error E. E=______ ​(Round to three decimal places as​ needed.)

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