Question

Garaci et al. (2012) examined a sample of people with and without sclerosis. (MS) totes the controversial idea that the disease is caused by blood flow restriction resulting from a vein condition known as chronic cerebrospinal venous insufficiency (CCSVI). Of 39 randomly sampled patients with MS, 25 were found to have CCSVI and 12 were not. The researchers found an association between CCSVI and MS.

a. What is the explanatory variable and what is the response variable?

b. Is this an experimental study or an observational study?

c. Where might hypothesis testing have been used in the study?

Answer 1

a. What is the explanatory variable and what is the response variable?

The explanatory variable is chronic cerebrospinal venous insufficiency (CCSVI) and what is the response variable is MS.

b. Is this an experimental study or an observational study?

This is an observational study because Garaci et al. (2012) examined a sample of people with and without sclerosis.

c. Where might hypothesis testing have been used in the study?

The hypothesis testing might have been used in the study to find the association between CCSVI and MS.