References:
Box Plots Khan Academy’s one of 6 videos on box plots https://www.khanacademy.org/math/probability/data-distributions-a1/box--whisker-plots-a1/v/constructing-a-box-and-whisker-plot
Identifying Outliers by Khan Academy, the last of 12 Videos https://www.khanacademy.org/math/statistics-probability/summarizing-quantitative-data/box-whisker-plots/a/identifying-outliers-iqr-rule
&
Formula for Outliers https://www.khanacademy.org/math/ap-statistics/summarizing-quantitative-data-ap/stats-box-whisker-plots/v/judging-outliers-in-a-dataset
IQR – definition by StatTrek IQR = Q3 – Q1 http://stattrek.com/statistics/dictionary.aspx?definition=interquartile%20range
Using StatCrunch for Box & Whisker Plots https://www.youtube.com/watch?v=EAmlDV4i9Eo