Quartiles are the three points that divide the data set into four equal groups, each group comprising a quarter of the data. We could remove the lower and higher quartiles in order to get rid of outliers.
These thoughts were extracted from Udacity online course and cover topics such as: Visualizing relationships in data, Probability, Estimation, Outliers and Normal Distribution, Inference and Regression.
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The standard score is the signed number of standard deviations by which the value of an observation or data point is above the mean value of what is being observed or measured. Observed values above the mean have positive standard scores, while values below the mean have negative standard scores. z = (x - μ)/σ
When public figures write memoirs, there is always some indecision regarding how much they want to write of things as they were and how much they want to cut corners to avoid riling up others. I decided to write my memoirs exactly as they were, and I will not digress - not when things are ill at ease and not when they are comfortable.