1. Coding in the form y = a + bx 𝑦 =a + b 𝑥 and 𝑠 𝑦 = b 𝑠 𝑥
Mean Absolute deviation is 1 𝑛 (𝑥− 𝑥 )
Sum of Squares 𝑆 𝑥𝑥 = 𝑥 2 − 𝑥 2 n
Variance 𝑠 2 = 𝑆 𝑥𝑥 𝑛−1
Mean square deviation 𝑆 𝑥𝑥 𝑛
Root Mean square deviation 𝑆 𝑥𝑥 𝑛
Standard Deviation 𝑠= 𝑆 𝑥𝑥 𝑛−1
Mean is 𝑥 = 𝑥 𝑛
Median is 𝑛 𝑛 2 (continuous)
Outliers (mean)
𝑥 ±2𝑠 = max and min value
LQ 𝑛 𝑛 4 (continuous)
UQ 3(𝑛+1) 4 3𝑛 4 (continuous)
Midrange is xmax + xmin ÷ 2
Outliers (median) Q1 – (or Q3 +) 1.5x IQR
Coding in the form y = a + bx 𝑦 =a + b 𝑥 and 𝑠 𝑦 = b 𝑠 𝑥