Year 8 Science · Unit 4 · Lesson 2

Qualitative vs Quantitative Measurements

Challenge Worksheet

Name
Date
Class

Learning Goals

Warm Up

Because… chain

A geologist starts with a qualitative observation and transforms it into useful ordinal data. Fill in the missing steps in the chain.

Qualitative observation: "The rock is hard"
→
The hardness cannot be compared between rock samples
→
Use the Mohs hardness scale (1–10) and perform scratch tests with known minerals
→
The rock is assigned a hardness number (e.g. 7 = quartz hardness)
→

Overall outcome (what does the geologist now know?):

Go Deeper

Design a data collection sheet

Design a data collection sheet for investigating the effect of exercise intensity on heart rate. Complete the table below with the requested information.

Measurement Data type (continuous / discrete / ordinal) Units Why this measurement is useful
Quantitative measurement 1
Quantitative measurement 2
Quantitative measurement 3
Qualitative → semi-quantitative measurement

Show What You Know

1. Explain why a rating scale (e.g. "perceived effort: 1 = easy, 5 = exhausted") is considered ordinal data, not quantitative data. What limitation does this create for statistical analysis?

Challenge 3 marks

2. A student argues: "Qualitative data is useless because you can't graph it." Construct a counter-argument using at least one real Australian scientific example from the lesson.

Challenge 3 marks

Wrap Up

In one sentence, what was the main idea of this lesson?

HSCScience · Year 8 Science · Unit 4 · Lesson 2 · Challenge Worksheet