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a random sample of 2000 Europeans aged 25 and over responded to the survey. A sample of this size provides a margin of error of

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a random sample of 2000 Europeans aged 25 and over responded to the survey. A sample of this size provides a margin of error of +/- 3.4 percentage points, 19 times out of 20. What is the standard error? What would be the margin of error for the 86% confidence interval, if the sample size was 1500 instead of 2000

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