UNI_FOUNDATION · Statistics · STAT.SAMPLING

Sampling and estimation basics

Intuition

Understand first, compress later.

Statistics describes data and separates visible patterns from random variation.

Switch representations

Spinner model4 sectors

sector size ∝ probabilitypointer

Each sector is as large as its probability: A 180°, B 90°, C 45°, D 45°. Together they fill the whole circle, so 1/2 + 1/4 + 1/8 + 1/8 = 1. Read backwards, every probability is an angle divided by 360°.

Formal view

You can sampling and estimation basics when you can recognise the underlying objects, select valid rules and check each step for equivalence or logical implication.

Why does it work?

This skill sits on a prerequisite network. If a step is unstable, repair the missing prerequisite instead of merely doing more items of the same type.