Lecture 1 - Data

Statistics - Science of learning from data ->Data to knowledge

Obtaining information about a target population through a sample Target Population: All relevant subjects of interest Sample: Representative Subset of population

Variables = Features of interest

Denoted by $x$ or $y$ if numerical Denoted $X$ or $Y$ if Random Variable

Measures of centre (Numerical)

Centre of Data = Middle of data -> Median (Numerical) Spread = How variable