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eMusic Study Pack • Physics
Student
📖 Comprehensive Note
Accuracy refers to how close a measured value is to the true or accepted value of a physical quantity.
Precision refers to how close repeated measurements are to each other, regardless of whether they are close to the true value.
Key points:
- High accuracy means the measurement is close to the true value.
- High precision means measurements are consistent and repeatable.
- A measurement can be precise but not accurate.
- A measurement can be accurate once but not precise if repeated measurements vary widely.
🎤 Lyrics
VERSE 1 (Accuracy)
Accuracy is the closeness
Of a measured value
To the true or accepted value
Of a physical quantity.
CHORUS (Precision)
Precision is the closeness
Of repeated measurements
To one another,
Even if they are not close to the true value.
VERSE 2 (Contrast & Reinforcement)
A result can be precise,
Yet not accurate in truth,
And it can be accurate once
Without precision too.
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📘 Line-by-Line Study Guide
| Lyric Line | Explanation |
|---|---|
| Accuracy is the closeness of a measured value | Describes how near a measurement is to the true or accepted value. |
| To the true or accepted value of a physical quantity | The reference or correct value that measurements aim to match. |
| Precision is the closeness of repeated measurements | Shows how consistent multiple measurements are, regardless of accuracy. |
| To one another, even if they are not close to the true value | Repeated measurements can be consistent but all wrong if not near the true value. |
| A result can be precise, yet not accurate in truth | Measurements can be tightly grouped but far from the true value. |
| And it can be accurate once without precision too | One measurement may hit the true value, but repeated attempts vary widely. |
💡 Mnemonic
“AP – True vs Tight” – Easy way to recall key points:
- A – Accuracy: How close a measurement is to the True or accepted value.
- P – Precision: How Tight or consistent repeated measurements are.
- A measurement can be precise but not accurate.
- A measurement can be accurate once but not precise if repeated measurements vary.
❓ Quiz
1. What does accuracy measure?
2. What does precision measure?
3. Can a measurement be precise but not accurate?
4. Can a measurement be accurate once but not precise?
5. Which statement is correct?
🃏 Flashcards
What is accuracy?
Closeness of a measured value to the true or accepted value.
What is precision?
Closeness of repeated measurements to each other.
Can a measurement be precise but not accurate?
Yes, repeated measurements can be consistent but far from the true value.
Can a measurement be accurate but not precise?
Yes, one measurement may hit the true value, but repeated attempts vary widely.
Why is it important to understand both accuracy and precision?
To ensure measurements are both correct and consistent for reliable results.
🎯 Drag & Drop
Closeness to true value
Closeness of repeated measurements
Accuracy
Precision
📌 Summary
- Accuracy – How close a measured value is to the true or accepted value.
- Precision – How close repeated measurements are to each other.
- A measurement can be precise but not accurate.
- A measurement can be accurate once but not precise if repeated attempts vary.
- High accuracy ensures correctness; high precision ensures consistency.
- Understanding both is crucial for reliable and meaningful results in experiments.
- Accuracy requires proper calibration and correct procedure.
- Precision requires careful repetition and consistent method.