1-Var Statistics IB Math AA SL

Qualitative (categorical)

Non-numerical

Quantitative

Numerical

Discrete

Countable values (ex. number of siblings)

Continuous

Measured values (ex. height, time)

Mean

Arithmetic Average

Median

Middle value

Mode

Most frequent value

Simple Random Sampling

Every member of the population has an equal chance of being selected.

Systematic Sampling

Select every k-th member of the population after a random start.

Stratified Sampling

Divide population into strata (groups), then take a random sample from each stratum proportional to its size

Quota Sampling

Select people until you reach a fixed _____ for each group.

Convenience Sampling

Selecting individuals who are easiest to reach.

Lower Bound Outlier Equation

Q1-(1.5 x IQR)

Upper Bound Outlier Equation

Q3 + (1.5 x IQR)