How do you do an Outlier test? - Answers

To conduct an outlier test, you can use statistical methods such as the Z-score or the interquartile range (IQR). For the Z-score method, calculate the Z-score for each data point, which measures how many standard deviations a point is from the mean; values typically greater than 3 or less than -3 are considered outliers. Alternatively, with the IQR method, find the first (Q1) and third quartiles (Q3) to calculate the IQR (Q3 - Q1), and identify outliers as points that fall below Q1 - 1.5 * IQR or above Q3 + 1.5 * IQR.