Probability & Statistics
Topics, misconceptions, and exam techniques for probability & statistics.
Averages and Spread
The Three Averages Mean — Add all values, divide by how many there are. Median — The middle value when data is in order. For an even number of values,...
Probability (Single Event)
What is Probability? Probability measures how likely an event is to happen, on a scale from 0 to 1: - 0 = Impossible - 1 = Certain - Values in between...
Combined Probability and Tree Diagrams
Combined Events When two or more events happen, we can find probabilities using: - AND (both events) → multiply probabilities - OR (either event) → ad...
Cumulative Frequency and Box Plots
Cumulative Frequency Cumulative frequency is a running total of frequencies. It tells you how many values are less than or equal to a given value. | C...
Scatter Graphs and Correlation
A scatter graph shows the relationship between two variables by plotting pairs of values as points. Types of Correlation | Type | Pattern | Example |...
Histograms H
A histogram displays continuous data with bars where area represents frequency, not height. This makes histograms different from bar charts. Why Histo...