Distribution

center

• mean, median, and mode

spread

• IQR, range, standard deviation

shape

• symmetric, skewed to the right or left

outlier

• Q1 - 1.5IQR
• Q3 + 1.5IQR

difference between an outlier & influential point - influential point changes the slope of the graph

Transformation (Ax+b)

• centers are affected from ax+b
• positions (min, max, Q1, and Q3) are affected from ax+b
• Z score is not affected by ax+b
• spreads are only affected by ax

Correlation

correlation(r) - measures the strength & direction of 2 quantitative variables

• positive r = positive linear
• negative r = negative linear