2.1 Hypothesis: As altitude increases, the number of red blood corpuscles in a person's blood decreases.
2.2 Dependent variable: The number of red blood corpuscles in a person's blood.
2.3 Independent variable: Altitude (height above sea-level).
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Question 2
2. A scientist knew that as one moves to higher altitudes(height above sea-level), the air has less oxygen. She therefore wanted to investigate the relationship between altitude and the number of red blood corpuscles in a person's blood.
2.1 Formulate a hypothesis for the scientist's investigation.
2.2 State the dependent variable.
2.3 State the independent variable.
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