Plan a Test and Bound a Claim
Connect a changed condition, a recorded outcome, and a cautious conclusion.
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
A question tells you what to compare. For “Does daily light time affect height growth?” change light time, keep other relevant conditions alike, and record height change over the same number of days. Keep water, plant type, starting size, soil, and pot size alike. A plan that also changes water cannot separate their possible effects.
Consider supplied results from such a fictional light comparison: three seedlings under longer light grew 2, 3, and 2 cm; three under shorter light grew 1, 2, and 1 cm. The longer-light group has larger recorded changes overall, but one plant in each group grew 2 cm. These notes support a statement about these groups, not a claim that every plant needs exactly this schedule.
- State the changed condition and two conditions kept alike.
- Circle the recorded outcome: height change in cm.
- Compare the six supplied growth values and find the shared 2 cm value.
- Write a conclusion that names the observed groups and avoids “every plant.”
See the method in action
The longer-light values sum to 7 cm across three plants; the shorter-light values sum to 4 cm. The longer-light group recorded more total growth, with overlap at 2 cm, so repeating the comparison would help check the pattern.
Check your reasoning
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See the answer and explanation
These longer-light seedlings recorded more total growth; test more plants before generalizing.
The totals are 7 cm and 4 cm for equal-sized groups. This small supplied comparison does not establish a universal growth rule.
Take it further
Replace the longer-light values with 1, 2, and 1 cm. Both groups now total 4 cm. The revised data no longer show a difference in group totals.
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Check the subject sources
These LifeStarter passages, scenarios and exercises are authored for this Academy with AI assistance and review. External resources keep their publishers’ terms. A grade label suggests a starting level; it does not establish alignment with your school’s complete requirements.