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Investigating variation in human traits
Method
Method to investigate variation in human traits
A class measures the height and records the blood group of 30 students. Heights are measured using a meter rule to the nearest millimeter. Blood groups are identified from medical records. The independent variable is the trait type (height or blood group). The dependent variable is the measurement or category recorded. Control variables include measuring height at the same time of day and using the same equipment.
| Step | Description |
|---|---|
| 1 | Measure height of each student using a meter rule. |
| 2 | Record blood group of each student from medical records. |
| 3 | Repeat measurements to ensure accuracy. |
| 4 | Record data in a table. |
| 5 | Analyze data to identify variation type. |
- a[2]
Identify the independent and dependent variables in this investigation.
Aim for approximately 2 distinct marking points.
- b[3]
Explain how the data collected can show continuous and discontinuous variation.
Aim for approximately 3 distinct marking points.
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