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.
Obviously 90 is the outlier. With it in there, the mean is 67.5, and the median is 63.5 (halfway between 63 and 64). If you take the 90 out, the new average is 63, and the median is also 63. So basically, it affects mean more because when dealing with median it doesn't matter what the actual value of the outlier is.