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Tadpole population graph construction
Table 1 shows the results.
| Sample number | 0 weeks | 1 week | 2 weeks | 3 weeks | 5 weeks | 8 weeks |
|---|---|---|---|---|---|---|
| 1 | 11 | 17 | 8 | 9 | 5 | 0 |
| 2 | 15 | 11 | 12 | 7 | 0 | 5 |
| 3 | 23 | 16 | 14 | 10 | 7 | 3 |
| 4 | 11 | 14 | 16 | X | 4 | 4 |
| Totals | 60 | 58 | 50 | 32 | 16 | 12 |
Complete Figure 4 to show how the total number of tadpoles changed over the 8 weeks.
- label the x-axis
- use a suitable scale for the x-axis
- plot the data for the total numbers of tadpoles from Table 1
- draw a line of best fit
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Marking points
- 1 Uses a suitable linear x-axis scale and labels it 'weeks'.
- 2 Plots at least four points accurately.
- 3 Plots all six points accurately for the additional plotting mark.
- 4 Draws a curved line of best fit rather than joining points directly.
Full-mark answer
Label the x-axis 'weeks' with a linear scale spanning 0 to 8. Plot (0,60), (1,58), (2,50), (3,32), (5,16) and (8,12), then draw a smooth curved line of best fit through the trend.
Why this answer loses marks
Plot the data and join each point with straight lines.
The points may score, but the required trend is a curved line of best fit; the axis also needs a suitable label and scale.