A fitted conclusion states the pattern, quotes a figure, and names one limit. Replace words like always, all, proves and best with wording that matches what was actually tested.
This lesson closes the four-lesson set on evaluating a science claim from a supplied dataset. It uses the checks from separating a repeated result from a fair-test design.
What is the scope-words checklist?
Before you submit an answer, scan for these words and ask whether the data justifies each.
- always, never, all, every: was every case tested?
- proves, shows for certain: can a few readings prove anything?
- best, worst: best compared with what was tested?
- makes, causes: was the design fair enough to claim a cause?
If the answer to the question after a word is no, replace the word.
Worked example: sugar and temperature
An original test timed 1 teaspoon of sugar dissolving in 100 mL of water, stirred in the same way each time. One trial was done at each temperature.
| Water temperature | Time to dissolve |
|---|---|
| 20°C | 95 s |
| 40°C | 60 s |
| 60°C | 38 s |
An overconfident conclusion: “Heat always makes things dissolve faster, which proves that hot liquids are best for dissolving.”
What is wrong. The data covers one substance, one liquid, three temperatures and one trial each. “Always”, “things” and “proves” go far beyond that.
Step 1: state the pattern with figures. The time fell from 95 s at 20°C to 60 s at 40°C, a drop of 95 − 60 = 35 s. It fell again to 38 s at 60°C, a further drop of 60 − 38 = 22 s.
Step 2: add the limit. Only one trial was done at each temperature, only sugar in water was tested, and the gaps are not equal.
A fitted conclusion: “In this test, sugar dissolved faster in water as the temperature rose, from 95 s at 20°C to 38 s at 60°C. Only one trial was done at each temperature and only sugar in water was tested, so the result cannot be extended to other substances or liquids.”
The mistake that costs marks
The slip is a correct idea in an overconfident sentence. The marker marks what is written, so the scope words can lose the mark.
| Overconfident | Fitted |
|---|---|
| “Heat always speeds dissolving” | “Sugar dissolved faster in warmer water in this test” |
| “This proves the hypothesis” | “The data supports the hypothesis” |
| “Hot water is the best solvent” | “Of the three temperatures tested, 60°C gave the shortest time” |
The repair is to swap each scope word for a phrase that names what was tested.
Check yourself
Fictional data: Antacid A neutralised a fixed amount of acid in 40 s. Antacid B neutralised the same amount in 55 s.
One trial each, same volume and starting acid. A student writes, “Antacid A is the best because it works faster.” Rewrite the conclusion.
Answer
A fitted conclusion: “In this test, Antacid A neutralised the acid in 40 s, which was 55 − 40 = 15 s faster than Antacid B. Only one trial was done for each antacid, so the result is weak, and the test does not show how they compare for other amounts of acid or for effects in the body.”
It names the figure, the difference and two limits, and it replaces “best” with the specific measured result.
What to study next
Test all four checks together in the integrated practice set. The claim evidence revision desk helps you rewrite your own conclusions.
To have a teacher read your conclusions, see online one-to-one Science tuition.