📄️ Descriptive Statistics
Mean, median, mode, range, variance, standard deviation and quartiles — what each one tells you and when it misleads.
📄️ Correlation and Covariance
Measuring whether two variables move together — the correlation scale, why covariance can't be compared, and what correlation misses.
📄️ Exploratory Data Analysis
The EDA workflow — inspect, check for gaps, describe, count categories, group, and correlate.