Topic 3F: Cardiovascular Disease

Question 1

The statistical test of data from an experiment showing a correlation gave a P value of 0.02. What is the significance of this? [3]

Answer 1

1. There is a less than 0.05 probability that the correlation is due to chance;
2. Correlation is significant;
3. Correlation does not mean causation.

Question 2

Suggest why the pulse can be used to measure heart rate. [2]

Answer 2

1. Caused by surge of blood;
2. From (one) contraction of (left) ventricle

Question 3

Why is it important that volunteers are healthy in cardiovascular based investigations? [1]

Answer 3

1. Healthy volunteers have ‘normally’ functioning vessels

Question 4

Explain why volunteers are divided into groups randomly. [1]

Answer 4

1. Avoids bias