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AQA GCSE · Question 05.2 · Data Visualization and Representation
The graph shows the average adult BMI over recent years. A healthy BMI is considered to be between 18.5 and 24.9. Make two distinct comments about the graph.
The graph shows the average adult BMI over recent years. A healthy BMI is considered to be between 18.5 and 24.9. Make two distinct comments about the graph.
How to approach this question
You need to make two different points. \n1. Look at the overall trend of the line. Is it generally going up, down, or staying the same? \n2. Compare the values on the y-axis (BMI) to the "healthy" range given in the question (18.5 to 24.9). What do you notice about all the data points shown?
Full Answer
Any two of the following:
1. The average adult BMI has been consistently above the healthy range (of 18.5-24.9) for the entire period shown.
2. There is a general upward trend in average adult BMI from 1995 to 2015.
3. The average BMI increased from approximately 26 in 1995 to around 27.5 in 2015.
4. The rate of increase was steeper in the late 1990s than in the late 2000s.
1. **Trend Analysis:** The line on the graph generally moves upwards from left to right. This indicates a positive trend, meaning the average adult BMI has been increasing between 1995 and 2015. \n2. **Contextual Comparison:** The question states a healthy BMI is between 18.5 and 24.9. Looking at the y-axis, the lowest point on the graph is around 26, and the highest is above 27. All the data points for the entire period are above the maximum healthy value of 24.9. This means the average adult has been in the 'overweight' category throughout this period.
Common mistakes
✗ Simply reading one value from the graph (e.g., "In 2005 the BMI was 27"). This is an observation, not a comment on the overall graph.\n✗ Making two very similar comments (e.g., "The BMI went up" and "There is a positive trend"). These are not distinct.
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