Question

Read the scenario and answer the question that follows: An experiment was set up to study two drugs, Lipanthyl and Befizal, based on their effect on cholesterol level in blood. A group of 25 men with high cholesterol level were randomly assigned one of the two drugs. The level of LDL was measured right before the treatment and again after the 3-month treatment. Suppose we wanted to compare the LDL levels pre and post treatment with Lipanthyl. 1. Would you perform a one-sample t-test, a paired t-test or an independent samples t-test on these data?2. Explain your answer. 3.Write down the explanatory variable and the response variable in this study.

Answer 1

1. )

Answer: A paired t-test

Reason: We are considering only Lipanthyl. The same patients are measured pre and post treatent. So a paired t-test

2.)

We want to compare difference between mean values of LDL level measurement for the same patients taken at two different times. Thus the values are matched for every individual in each sample measurement. Hence, we should use a paired t-test.

3.)

Explanatory Variable: Treatment using drug Lipanthyl

Response Variable: Level of LDL in blood

Reason: We want to find out whether LDL level in blood is affected by the treatment. Thus, we want to check if using Lipanthyl affects the LDL level in blood.In this case, the treatment(or Lipanthyl) becomes independent variable(explanatory variable) and LDL level becomes dependent variable(response variable).