Confidence Interval Assignment Problems and Solutions - Statistics | STAT 100, Assignments of Statistics

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Practice Problems on choosing how many people to poll in surveys that can be modeled with 0 — 1 boxes Obviously, the more people we randomly poll the more accurate our sample will be. 1, Ina pre-election poll in a close race how many people would you need to poll to get: (In a close race you can assume that the SD of the box is 0.5) a) a margin of error for a 95% confidence interval of 2%? b) a margin of error for a 95% confidence interval of 5%? 2. Suppose it’s not a close race and it’s likely to be a9 to 1 landslide, then the SD of the box would only be 0.3 and you wouldn’t need as many people for the same level of accuracy. How many people would you need to poll to get ... a) a margin of error for a 95% confidence interval of 2%? b) a margin of error for a 95% confidence interval of $%? i g : i | : ,