lesson
Choose a graph for the data
1 · Learn
A bar chart can compare categories such as favourite fruits. A time graph can show a measured quantity changing over time. Label both axes and use consistent scales.
For a plant-height record at weeks 1, 2 and 3, the heights might be 4 cm, 7 cm and 9 cm. Plot time horizontally and height vertically. Joining measurements can suggest change between times, but does not prove every unmeasured value.
2 · Worked example
The recorded increase from week 1 to week 2 is 3 cm. From week 2 to week 3 it is 2 cm, so the first recorded interval has the larger increase.
3 · Your turn
Using the supplied record, what is the total increase from week 1 to week 3? Was the plant definitely exactly 8 cm halfway through week 2 and 3?
Check your answer
5 cm. No: that value was not measured; a straight connecting line is not proof of the exact intermediate height.
4 · Apply your learning
Draw a labelled time graph of the supplied record. Separately make a bar chart for three invented category counts and explain the difference.
Adult guidance and safety
Use practical or drawn representations and explain the method. Check units and labels. A correct answer to one example is not evidence of secure fluency; revisit with varied numbers and feedback.
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