First, consider deliberate thinking. Deliberate thinking is relatively slow, rule-based and explicit; a contemplative process of weighing pros and cons, gathering scientific or statistical evidence. It would appear that this makes for pretty solid decision-making.
Jul 24, 2015. Outliers increase the standard deviation. Mean is most affected by outliers, since all values in a sample are given the same weight when calculating mean. A value that is far removed from the mean is going to likely skew your results and increase the standard deviation. Say you have five values: 2, 1, 2, 1.5, and 2.1.
The reason that an outlier differs from the rest of the points in the data set is crucial in determining whether to omit the outlier or not. Generally, outliers that can be attributed to an error of some sort-an error in measurement, recording, or experimental design, for instance-are omitted.