A psychologist asks 40 pupils where they prefer to study.
| Study location | Number of pupils |
|---|---|
| Bedroom | 16 |
| Library | 12 |
| Kitchen | 8 |
| School study room | 4 |
A student presents the results in a bar chart. The labels 0, 4, 8 and 12 are each 1 cm apart on the vertical axis, but the label 16 is 2 cm above 12. Each bar reaches the label for its frequency. The bedroom and library bars are 1 cm wide, the kitchen bar is 2 cm wide and the school study room bar is 3 cm wide. The bars are separated by equal gaps.
Explain two problems with the student's bar chart.
173 exam-style questions on OCR GCSE Psychology 7.3 Analysing Research, covering 7.3.1 Types of Data, 7.3.2 Measures of central tendency, 7.3.3 Other descriptive statistics, 7.3.4 Tables, Charts and Graphs, 7.3.5 Reliability, 7.3.6 Validity and effects on validity, and 7.3.7 Sources of bias. Each one has a worked solution and a mark scheme showing where the marks go.