Statistics — Edexcel GCSE Mathematics
In summary: Statistics is a key topic in Edexcel GCSE Mathematics. Key exam tip: Always show working when calculating the mean from grouped data
Exam Tips for Statistics
- Always show working when calculating the mean from grouped data
- Ensure the sum of angles in a pie chart is 360 degrees when constructing one
- Use a ruler for drawing lines of best fit on scatter graphs
- Check the units and scales on axes before interpreting data
- Remember that the median is the middle value of an ordered list
Common Mistakes
- Confusing correlation with causation in scatter graphs
- Incorrectly calculating the mean from a grouped frequency table by using class intervals instead of midpoints
- Misinterpreting the scale on cumulative frequency graphs
- Failing to label axes correctly on statistical diagrams
- Extrapolating trends beyond the range of given data without acknowledging the risk
Marking Points
- Correct construction of frequency tables, bar charts, pie charts, and pictograms
- Accurate calculation of mean, median, mode, and range
- Correct interpretation of scatter graphs including correlation and lines of best fit
- Appropriate use of histograms with equal and unequal class intervals
- Accurate calculation of cumulative frequency and inter-quartile range
- Correct identification of outliers in data sets
- Understanding the limitations of sampling and the dangers of extrapolation
📖 Read the full Statistics Study Guide
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