This deep dive covers Common Mistakes to Avoid within Bar Charts & Pictograms for GCSE Mathematics. Revise Bar Charts & Pictograms in Statistics for GCSE Mathematics with 11 exam-style questions and 20 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 9 of 11 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Common Mistakes to Avoid
Bar Charts:
- ❌ Unequal bar widths: Makes comparison difficult
- ❌ Not starting at zero: Can make differences look bigger than they are
- ❌ Missing labels: Chart becomes unclear without proper labels
- ❌ Inappropriate scale: Too large or too small for the data
Pictograms:
- ❌ No key: Essential for understanding the data
- ❌ Inconsistent symbol size: Larger symbols suggest larger values incorrectly
- ❌ Poor symbol choice: Unrelated or unclear symbols
- ❌ Inaccurate partial symbols: Estimating fractions instead of calculating precisely
Practice questions for Bar Charts & Pictograms
In a pictogram, the key shows that one symbol represents 4 people. A row shows 3 and a half symbols. How many people does this row represent?
A bar chart comparing two companies' sales has a vertical axis starting at 900 rather than 0. Company A has sales of 950 and Company B has sales of 1000. Explain why this bar chart could be misleading.