HSC validity reliability accuracy
Validity, Reliability and Accuracy in HSC Science
A clear guide to validity, reliability, and accuracy for HSC Investigating Science, with examples of the answer links students often miss.
Independent. Not official HSC/NESA.
Why students lose marks
Students often use validity, reliability, and accuracy as if they are interchangeable. HSC-style responses usually need the specific term plus a method change plus the effect on evidence quality.
Validity answer pattern
A valid method tests the intended relationship. To improve validity, identify the variable that must be controlled or the method change that makes the test better match the question.
Reliability answer pattern
A reliable method gives consistent results. To improve reliability, repeat trials, increase sample size, or standardise the method so random variation has less effect.
Accuracy answer pattern
An accurate measurement is close to the true value. To improve accuracy, use calibrated equipment, reduce measurement error, or choose equipment with a suitable scale.
Related practice
Keep the next click useful.
These internal links help students move from reading to practice, and help search engines understand the HSC Science topic cluster.
FAQ
Quick answers.
What is validity?
Validity is about whether the method actually tests the intended variable or claim.
What is reliability?
Reliability is about consistency. Repetition, larger sample size, and controlled conditions can help make results more dependable.
What is accuracy?
Accuracy is about closeness to the true or accepted value, often improved by calibrated or more precise equipment.