Year 8 Science · Unit 4 · Lesson 2
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Learning Goals
Compare two
Complete the table to compare qualitative data and quantitative data across five features.
| Feature | Qualitative Data | Quantitative Data |
|---|---|---|
| What it describes | ||
| Units required? | ||
| Can be graphed easily? | ||
| Statistical analysis possible? | ||
| One advantage |
Scenario
A Year 8 student, Jarrah, investigates whether playing music affects plant growth. In their lab notebook they write: "The plants with music look healthier and taller." Their teacher says: "You need to improve your data collection before you can draw a valid conclusion."
(a) Describe how Jarrah could convert the qualitative observation "look healthier" into quantitative data. Give a specific method.
(b) Name two specific quantitative measurements Jarrah could take to measure plant growth. Include units for each.
(c) Explain why quantitative data leads to stronger scientific conclusions than qualitative data alone.
1. The Australian Bureau of Statistics records the number of children per household and the average household income. Which is discrete and which is continuous? Explain.
2. A CSIRO scientist studying coral bleaching records both "the coral appears pale with white patches" and "water temperature 29.5°C." Explain why both types of data are needed for a complete scientific picture.
Wrap Up
In one sentence, what was the main idea of this lesson?