When Two Groups Disagree

Lab Brief #6

🎯 Your mission

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

⚡ The twist

The first design always fails. That's the point.

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

Guess: what's the weakest part of this build?

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 first computer bug was a literal moth stuck inside a machine in 1947.

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: Every bridge, building, and gadget you've ever used started with this.

🏆 Stretch challenge (try it this week): Find something that's broken at home and try to figure out *why* it broke.

👨‍👩‍👧 For the dinner table: “What's something around the house you'd redesign — and how?”

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