(image source: W3 School point)
- within 1st Standard Deviation, 68% of the data will fall
- within 2nd Standard Deviation, 95% of data will fall
- within 3nd Standard Deviation, 99.7% of data will fall
- calculating Z-Score
- calculating Inter Quartile Range (IQR)
Z = standard score
x = observed value
µ = mean of the sample
∑ = standard deviation of the sample
- Short the dataset
- calculate 1st Quartile and 3rd Quartile
- find Lower fence = Q1 -1.5(IQR)
- find Upper fence = Q3 -1.5(IQR)