# Statistics

## Relative Frequency

This is just the number of times something happened (frequency) divided by the number of times you tried the experiment.Relative Frequency = Frequency / Number ...

## Tree Diagrams

A tree diagram is just a way of showing all the possible outcomes of an event or series of events. Above is an example of one showing the possible outcomes when...

## AND / OR Rules

Combined ProbabilityWhen you have two or more events happening in a question: Break the question down into a sequence of separate events Find the probabil...

## Listing Outcomes and Expected Frequency

Sample Space DiagramsSample space diagrams can be used to list all outcomes.Example: A spinner has three sides numbered 1, 2 and 3. It is spun twice and the res...

## Basic Probability

All Probabilities Are Between 0 And 1 A probability of 1 means something is certain to happen A probability of 0 means something definitely won't happ...

## Scatter Graphs

Scatter graphs tell you how closely two things are related....which is called "correlation".If you can draw a line of best fit on your graph quite close to most...

## Other Charts

Frequency PolygonsThese are just used to represent grouped data. You take the mid-interval value of each class and draw a straight line between each of the poin...

## Histograms and Frequency Density

Histograms are like bar charts but the bars can have different widths...and the area of the bar shows the frequency...sounds confusing right? Don't worry we'll ...

## Cumulative Frequency

Cumulative frequency means you just keep a running total as you go along. Example: The table below shows the lengths of 32 bananas. Draw a cumulative frequency ...

## Frequency Tables

A frequency table tells you how many items from a data set are in each category.Within a frequency table: The mode is just the category with the most entrie...