Evidence: The Support Behind a Claim
Once you can spot a claim in a passage, the next question is the one that decides most reasoning items: does the evidence actually support it? Evidence is the set of facts, measurements, and observations offered to back up a claim. Strong evidence makes a claim believable. Weak or thin evidence leaves a claim hanging, no matter how confident it sounds.
This is good news for test day. You do not have to know the science ahead of time. You have to judge whether the support in front of you is enough to trust the claim. That is a skill you can practice.
Let’s look at what makes evidence strong, what makes it weak, and how the test uses the difference.
What Strong Evidence Looks Like
Evidence is stronger when it is specific, measured, and repeated. A number from a careful measurement (“the water rose 4 degrees in ten minutes”) is stronger than a vague impression (“the water got warmer”). Results from many trials are stronger than a single lucky outcome. And a comparison — a group that got the treatment versus a group that did not — is stronger than one case on its own.
Try this passage:
A gardener claims a new plant food speeds growth. Her evidence: one plant given the food grew taller than one plant given plain water, over three weeks, on the same windowsill.
The claim is that the plant food speeds growth. The evidence is a single plant compared to a single other plant. That is a start, but it is thin. One plant might grow faster for many reasons unrelated to the food. Strong evidence would use many plants in each group, so a single odd plant cannot swing the result.
What Weak Evidence Looks Like
Evidence is weaker when it comes from one case, from a story instead of a measurement, or from a group too small to trust. “My cousin took this vitamin and never gets sick” is a single story, not evidence a scientist would rely on. On the test, be suspicious of a strong claim propped up by a single example.
A key move: match the size of the evidence to the size of the claim. A small study can support a small, careful claim (“in this trial, the plant food was linked to taller plants”). It cannot support a sweeping one (“this plant food makes any plant grow faster”).
Which Evidence Supports the Claim?
The test often shows a claim and several facts, then asks which fact best supports it. The winning choice is the one that speaks directly to the claim, with a measurement or comparison. Facts that are true but off-topic are distractors. So read the claim, then ask of each option: does this actually give a reason to believe this specific claim?
It also helps to notice what evidence is missing. If a claim is about long-term effects but the evidence only covers three weeks, the gap itself is the point — and the test may ask you to spot it.
Watch: A Short Video Lesson
SBCUSD walks through this skill clearly in a few minutes. It is a helpful companion to the reading above:
A Routine for Evidence Questions
- State the claim in one sentence.
- List the evidence offered and ask: is it specific, measured, and repeated?
- Match the evidence to the claim — does it support this exact point?
- Notice what is missing. A claim is only as strong as the evidence behind it.
Practice
- What is evidence, in your own words?
- Which is stronger: a result from 100 plants, or a result from 1 plant? Why?
- “The water rose 4 degrees in ten minutes” or “the water got warmer” — which is stronger evidence?
- A claim covers ten years, but the study lasted one month. What is the problem?
- Why is a single personal story usually weak evidence?
- What should the size of the evidence match?
Answers
- The facts, measurements, and observations offered to support a claim.
- 100 plants — more trials reduce the chance that one unusual plant swings the result.
- “The water rose 4 degrees in ten minutes” — it is specific and measured.
- The evidence does not cover the time span of the claim, so it cannot support it.
- It is one case and not a careful measurement, so it may not hold in general.
- The size and strength of the claim.
Where This Fits in Your Science Prep
Judging evidence sits between identifying the claim and drawing a valid conclusion. It also feeds directly into the trap of correlation versus causation. Find every topic 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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