Look at More Than One Plant
Use repeated observations to see variation within a group.
Supplied materials
- Use the supplied fictional observations or model. Paper and pencil are optional; spoken answers are welcome. No equipment or real experiment is needed.
Learn the idea
Plants in the same group can have different results even when a plan keeps their conditions alike. Looking at several plants helps you see that variation. Here we count seedlings with new leaves; a group total does not tell what every individual did. Repetition can strengthen evidence, but it is not a guarantee of the same result everywhere.
Read this fictional comparison, with same seedling type, starting size, soil, light, and one-week length. Planned-water group A1, A2, A3 has new leaves: yes, yes, no. Low-water group B1, B2, B3 has new leaves: no, yes, no. Only the water condition is intentionally different. Count each yes rather than replacing the mixed notes with “all.”
- Copy three yes/no entries for each water group.
- Count yes entries: two in planned water, one in low water.
- Find a no in the planned-water group and a yes in the low-water group.
- Describe the comparison using counts and this one-week limit.
See the method in action
Two of three planned-water seedlings and one of three low-water seedlings had new leaves. The groups differed by one yes result; neither group had identical results for all its plants.
Check your reasoning
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See the answer and explanation
Two planned-water and one low-water seedling had new leaves.
The yes counts are two and one. A3 is no and B2 is yes, so claims about all or none would misread the notes.
Take it further
Change A3 to yes. Planned water now has three yes entries and low water still has one; the observed difference becomes two seedlings.
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