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 of the subjects on Lipanthyl versus those on Befizal.

- Would you perform a one-sample t-test, a paired t-test or an independent samples t-test on these data?
- Explain your answer.
- Write down the explanatory variable and the response variable in this study.

Answer #1

**Answer:**

**a)**

**A paired t - test :**

Generalization:

- Here we are thinking about just Lipanthyl.
- Similar patients are estimated pre and post treatment.
- So it is a (combined) paired t-test.

**b)**

- Here we need to think about contrast between mean estimations of LDL level estimation for similar patients taken at two distinct occasions.
- Accordingly the qualities are coordinated for each person in each example estimation.
- Consequently, we should utilize a matched t-test.

**c)**

**Explanatory Variable:**

Treatment utilizing drug Lipanthyl

**Response Variable:**

Level of LDL in blood

Logic:

- Here we need to see if LDL level in blood is influenced by the treatment.
- In this way, we need to check if utilizing Lipanthyl influences the LDL level in blood.
- In this case, the treatment(or Lipanthyl) winds up free variable i.e., explanatory variable and LDL level ends up ward variable i.e., response variable.

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