The margin of error formula is an equation that measures the range of values above and below the sample statistic. It is defined by taking the critical value and multiplying it by the standard error of the statistic. More »

The margin of error is calculated using two approaches: byÂ multiplying the critical value with the standard deviation of the statistic, or by multiplying the critical value with the standard error of the statistic when ... More »

A good statistical sample size is at least 100, and preferably more, participants. With a 100-participant sample size, the researcher has a margin of error of approximately 10 percent with a 95 percent confidence rating ... More »

The margin of error is calculated using two approaches: byÂ multiplying the critical value with the standard deviation of the statistic, or by multiplying the critical value with the standard error of the statistic when ... More »

In math, outliers are observations or data points that lie an abnormal distance away from all of the other values in a sample. Outliers are usually disregarded in statistics because they can skew calculations and cause t... More »

The formula to find a sample variance is as follows: s squared equals sigma(x-x-bar)squared over n-1. Working out the problem involves determining the mean, subtracting the mean for each number and then squaring the resu... More »

A confidence interval indicates how uncertain a researcher is about an estimated range of values. A 99 percent confidence interval indicates that if the sampling procedure is repeated, there is a 99 percent chance that t... More »