Question

How could this experiment be designed to be a double-blind?

1) By randomly assigning participants to treatment groups
2) By using a placebo control group
3) By ensuring that neither the participants nor the researchers know who is in the treatment group
4) By using a third-party to administer the treatment and collect data

Answer 1

A double-blind experiment can be designed by randomly assigning participants, using a placebo control group, ensuring blinding of participants and researchers, and using a third-party to administer the treatment and collect data.

Step-by-step explanation:

A double-blind experiment can be designed by:

1. Randomly assigning participants to treatment groups
2. Using a placebo control group
3. Ensuring that neither the participants nor the researchers know who is in the treatment group
4. Using a third-party to administer the treatment and collect data

Random assignment helps to eliminate bias, while a placebo control group helps to control for the placebo effect. Blinding both the participants and the researchers ensures that their expectations do not influence the results. Using a third-party to administer the treatment and collect data further reduces bias. These design elements make the experiment double-blind and help produce reliable data.