Question

Supplements for testosterone -As men age, their testosterone levels gradually decrease. This may cause a reduction in energy, an increase in fat, and other undesirable changes. Do testosterone supplements reverse some of these effects? A study in the Netherlands assigned $237$men aged $60$to $80$ with low or low-normal testosterone levels to either a testosterone supplement or a placebo.

Explain why it was necessary to include a control group in this experiment.

Short answer

Yes , the testosterone supplements reverse some of these effects and control group is necessary to include to notice the effect of placabo

Step-by-step solution

Given information

We need to find why it was necessary to include a control group in this experiment .

Explanation

Here control group is necessary to include because The control group is that the group that receives the placebo. we'd like to include a control group to actually notice the effect of placebo and understand how much of the differences in the other treatment groups are because of the placebo effect and due to
the effect of the treatment itself.