An environmental scientist is studying the primary nesting materials chosen by a population of urban magpies. The categories recorded are 'twigs', 'mud', 'grass', and 'synthetic debris'.
State the most appropriate type of graph the scientist should use to display the frequency distribution of these data.
513 exam-style questions on OCR A Level Psychology Data recording, analysis and presentation. Each one has a worked solution and a mark scheme showing where the marks go.