When Two Groups Disagree

Lab Brief #11

🎯 Your mission

Predict it first. Then prove yourself right (or wrong).

⚡ The twist

Nature loves to surprise the careful watcher.

What you'll learn

If two groups get different answers to the same question, one may have made a mistake — or the two may have measured slightly different things. Comparing methods line by line usually finds the reason faster than repeating the experiment.

Key words

method
The exact steps followed in an investigation.
discrepancy
A difference between results that ought to have agreed.

Make a hypothesis first

Before you start: write down what you think will happen, and why.

Say your guess out loud — then find out if you were right.

Get ready

🧰 What you need

class results
notebook

⚠️ Safety first

Have an adult check your set-up before you start, and tidy everything away afterwards.

Step 1 of 4 · Read

Think about what you just learned: say what "method" and "discrepancy" mean in your own words before you start.

Step 2 of 4 · Do

Compare your class's results for one experiment and pick the two groups furthest apart. Read both methods side by side, find the step where they differ, and test whether that step explains the gap.

Step 3 of 4 · Observe

Record what actually happened, including anything that did not match what you expected.

Step 4 of 4 · Record

Write a conclusion that answers the question this lesson opened with, and state your uncertainty.

Question 1 of 2

When two groups disagree, the first thing to compare is the:

How sure are you?😐 maybe

Question 2 of 2

A discrepancy between results means:

How sure are you?😐 maybe

Mind = blown

🔬 The more you look, the more nature shows you.

Nice work!

You got 0 of 2 right.

All lessons

🎯

Next Smart Experiment

We'll pick an experiment that matches exactly how you're thinking right now.

✨ More to explore

🌍 Where you see this in real life: This shows up in your everyday life more than you'd think.

🏆 Stretch challenge (try it this week): Try one experiment in real life this week — even a tiny one.

👨‍👩‍👧 For the dinner table: “What's the most surprising thing you learned today?”

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