Conclusions: What the Evidence Allows
A conclusion is what you are allowed to say after you have weighed the evidence. The whole trick on the test is staying inside the lines: a good conclusion goes exactly as far as the evidence allows, and no further. Most wrong answers in this part of the test are conclusions that overreach — they sound reasonable but claim more than the data can prove.
You already have the tools for this. Once you can find a claim and judge its evidence, drawing a valid conclusion is mostly about restraint: say what the data shows, and resist the urge to add what you merely suspect.
This lesson shows you how to draw conclusions that hold up and how to spot the ones that go too far.
Stay Inside the Evidence
Look at this passage:
In one small trial, patients who took a new cold remedy recovered about one day faster than those who did not. The researchers call for larger studies.
What can you safely conclude? Only what the data shows: in this small trial, the remedy was linked to slightly faster recovery. What you cannot conclude: that the remedy cures colds, works for everyone, or will hold up in a bigger study. The researchers themselves ask for more study, which is your clue that the current evidence is limited.
A valid conclusion often uses careful words — “suggests,” “was linked to,” “in this group.” An invalid conclusion uses bold words the evidence has not earned — “proves,” “always,” “cures,” “for everyone.”
The Overreach Trap
The test loves to offer a conclusion that is one size too big. If a study found that a fertilizer helped tomatoes in one garden, the overreaching conclusion is “this fertilizer helps all plants everywhere.” Same evidence, but the conclusion jumped from one garden and one crop to every plant on Earth. When you compare answer choices, the safest one usually stays closest to what was actually measured.
A simple check: could you defend this conclusion using only the sentences in the passage? If you need to add an assumption of your own, the conclusion probably reaches too far.
When Two Sources Point Different Ways
Sometimes the test gives you two short passages or two sets of results that seem to disagree. Do not treat a difference in wording as a contradiction. Ask whether the two sources used different samples, conditions, measurements, or time periods. Two studies can both be correct and still reach different results because they tested different things. A good conclusion accounts for both sources instead of picking one and ignoring the other.
Watch: A Short Video Lesson
John Peters walks through this skill clearly in a few minutes. It is a helpful companion to the reading above:
A Routine for Conclusion Questions
- Say what the data actually shows, in plain words.
- Prefer conclusions with careful language over bold language.
- Reject any choice that adds people, places, or time the study did not cover.
- If two sources differ, look for different conditions rather than a flat contradiction.
Practice
- What is a valid conclusion?
- A study of 20 students in one class found a study app raised their quiz scores. Which conclusion is safe: “the app helped these students” or “the app raises scores for all students”?
- Name two words that often signal an overreaching conclusion.
- Why is “the researchers call for larger studies” a useful clue?
- Two studies reach different results. What should you check before calling it a contradiction?
- What is the quickest test of whether a conclusion reaches too far?
Answers
- A statement that goes exactly as far as the evidence allows, and no further.
- “The app helped these students” — it stays within what was measured.
- Any two of: proves, always, cures, everyone, all.
- It signals that the current evidence is limited, so bold conclusions are not justified yet.
- Whether they used different samples, conditions, measurements, or time periods.
- Ask whether you can defend it using only the passage, with no added assumptions.
Where This Fits in Your Science Prep
Drawing conclusions is the payoff of the reasoning skills: finding the claim and weighing the evidence. The most common overreach of all gets its own lesson: correlation is not causation. See all topics on the Science Topics Hub.
Recommended Prep Books
These study guides and practice books help you keep building momentum as you prepare:
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