Stats quick revision - Maths Edexcel A-Level

Area of histogram bar =

(a)  

If k = 1, frequency density =

(a)  

Use the median with the

• IQR

• Standard deviation

• Mean

Use the standard deviation with the

• IQR

• Median

• Mean

Only use regression lines to make predictions for:

• Interpolation

• Extrapolation

• Values of the dependent variable

• Values of the independent variable

The range of values a random variable can take

• Sample space

• Random variable

• Variables

• Discrete variables

• Probability distribution

A variable whose value depends on the outcome of a random event

• Sample space

• Random variable

• Variables

• Discrete variables

• Probability distribution

Can take any range of specific values

• Discrete normal distribution

• Random variable

• Variables

• Discrete variables

• Probability distribution

Can only take certain numerical values

• Discrete normal distribution

• Random variable

• Variables

• Discrete variables

• Probability distribution

Fully describes the probability of any outcome in a sample space

• Discrete normal distribution

• Random variable

• Variables

• Discrete variables

• Probability distribution