There are times when taking multiple readings will improve the reliability of your data. But there are also many situations where doing so will not help improve your experimental results.

 

Some examples of when multiple readings will/ will not improve accuracy/ reliability of your reading:

(List is not exhaustive – don’t just memorise these examples – understand them.)

✅ Timing a pendulum period with a stopwatch
Human reaction time varies → repeats + average improves reliability

✅ Measuring wind speed
This may naturally vary → multiple readings and finding an average gives a fair “typical” value

❌ Using a micrometer with zero error
Repeating doesn’t remove the systematic error — you’ll just repeat the same wrong value

❌ Diameter of a wire at a point using a micrometer
repeated accurate readings at the same point will not result in different readings

✅ Average diameter of a wire using a micrometer
Measuring at different points along / around the wire may yield different readings and so an average gives a “typical” value for the diameter of the wire.

Practical Skills