Exam-style question
Try this first
A student measures the length of a table three times and gets 150 cm, 149.5 cm, and 150.5 cm. Identify the type of error present and explain why it is classified as such.
Model answer
What a good answer should say
- The measurements show random error because they vary slightly around a central value (150 cm) without a consistent bias.
- This variation could be due to factors like slight differences in measurement technique or environmental conditions.
Explanation
Why this works
This question assesses the student's ability to identify and explain random error based on practical measurement data. It requires understanding of how random errors manifest in repeated measurements, reinforcing the concept of measurement reliability.
Common mistake
No common mistake is linked to this question yet.