Identify the independent variable, a method to ensure reliability, the role of the control group, and the conclusion of the anastrozole medicine investigation.

Question 3.2.1 The independent variable in the investigation is the anastrozole medicine (or the administration of anastrozole medicine). Question 3.2.2 One way in which the reliability of the results was ensured for this investigation is by calculating the average testosterone level for each group. Another way is by using a sufficiently large sample size (30 men divided into two groups). Question 3.2.3 Group A served as the control group. Its importance was to provide a basis for comparison to show that any observed changes in Group B (the experimental group) were indeed due to the anastrozole medicine and not other factors. Question 3.2.4 Based on the investigation, it can be concluded that anastrozole medicine increases the average testosterone level in men with subfertility. That's 2 down. 3 left today — send the next one.