Statistical Variance and Margin of Error – For Dummies – Creating a Confidence Interval for the Difference of Two Means with Known Standard Deviations. If you know the standard deviations for two population samples, then ……

How to Calculate Margin of Error | eHow – How to Calculate Margin of Error. The margin of error is a number that represents the accuracy of a poll. One can determine this amount by using an algebraic formula ……

Explanation . The margin of error is usually defined as the “radius” (or half the width) of a confidence interval for a particular statistic from a survey….

Sometimes we know the population standard deviation and our level of confidence and ask,…

Typically poll results are accompanied by a margin of error. How does is this margin of error calculated? It’s really just a statement of the sample size and level of ……