Free interactive practice for the maths skills in GCSE and A level Psychology. At least 10% of the marks in both qualifications test these skills. Each tool gives you a new question every time, marks your answer instantly, explains common mistakes and shows a full worked solution. Each one has a quick guide with a plain-English explanation, the key facts and a step-by-step method, plus Standard and Harder levels. They suit AQA, OCR, Edexcel and Eduqas.
✏️ Paper first! Work each question out on paper before you check it, and write down every step. Examiners give marks for clear working even when the final answer is wrong.
GCSE and A level
Psychology Averages and Range
Mean, median, mode and range from study data, frequency tables, and choosing the best average.
Psychology Percentages, Fractions and Ratios
Turn results tables into percentages, fractions and ratios. Harder questions include percentage change and percentage points.
Psychology Significant Figures and Standard Form
Round to significant figures, tell s.f. from decimal places, and convert to and from standard form.
Psychology Graphs and Charts
Read values from bar charts and histograms, find differences and modal classes, and pick the right graph.
Correlation and Scatter Diagrams
Read scatter diagrams for direction and strength, match coefficients, and explain why correlation is not causation.
Data Types and Levels of Measurement
Quantitative or qualitative, primary or secondary, and nominal, ordinal or interval data.
Psychology Maths Symbols
Know and use =, <, <<, >>, >, ∝, ~ and the ≤ in p ≤ 0.05.
A level
Which Statistical Test?
Work through difference or correlation, design and level of data to choose the right test, then see a full-mark justification.
Sign Test Calculator
Work out N and S from paired data, find the critical value and decide whether the result is significant.
Critical Values and Significance
Use critical value tables for all eight tests: N or degrees of freedom, one- or two-tailed, and the “R rule”.
Type I and Type II Errors
Decide which error is more likely from the significance level, and explain why p ≤ 0.05 is the usual compromise.
Normal and Skewed Distributions
Normal, positive and negative skew: identify them from graphs or from the mean, median and mode.
Psychology Standard Deviation
Interpret standard deviations, use the 68–95% rule and, on Harder, calculate one step by step.
Content Analysis Tallying
Code examples into behavioural categories, then turn tallies into frequencies, percentages and percentage change.
Inter-Observer Reliability
Correlate two observers’ tallies, judge against +0.80 and, on Harder, calculate Spearman’s rho yourself.
Psychology Hypothesis Practice
Spot directional, non-directional and null hypotheses, check operationalisation and link hypotheses to one- or two-tailed tests.
Critical values for the sign, Wilcoxon and Mann–Whitney tests are calculated exactly; t, Pearson and chi-squared values come from their distributions; Spearman’s rho uses the standard published table. In an exam, always use the table extract you are given. Your marks are saved only in your own browser.