BTEC Applied Science Unit 3: Accuracy, precision, validity (D18) - FREE worksheet + answers

A complete, ready-to-teach lesson for Unit 3 (Science Investigation Skills): four words that are not interchangeable, and what each one judges.

This one is free. It is a full lesson, not a sample, so you can see exactly what the rest of the series looks like before buying anything.

Learning objectives:
• Define accuracy, precision, validity and reliability.
• Judge which of these a given weakness affects.
• Explain how a systematic error affects accuracy but not precision.
• Decide whether a conclusion is valid.

What’s included:
• Student worksheet (PDF and editable Word)
• Teacher version with model answers and mark schemes (PDF and editable Word)
• Teacher notes: lesson flow, common misconceptions and practical/safety notes
• Retrieval starter (5 marks)
• Structured tasks with key-idea boxes, data tables and printed graph grids
• Check for Understanding quiz (10 marks) with a confidence self-assessment
• Written-task practice (15 marks) based on an investigation scenario, ending with a levels-marked 6-mark question with indicative content

Specification coverage:
• C · Drawing conclusions and evaluation: evaluating the accuracy, precision, validity and reliability of the data and of the conclusions drawn from them.

About 60 minutes of teaching; the written-task section works in class or as homework. All questions are original.

Written for the Pearson BTEC Level 3 Nationals in Applied Science. Not endorsed by Pearson. Single-school licence.