Question 1
One study described in your book examined the effects of ginkgo biloba as an answer to one's memory problems. The study highlighted the importance of utilizing which one of the following controls?
◦ single-blind control
◦ double-blind control
◦ placebo control
◦ counter-balancing control
Question 2
Random assignment of participants to the experimental and control groups increases the likelihood that
◦ the two groups will be similar.
◦ the two groups will be different.
◦ the independent variable will not have a strong effect.
◦ if outcome differences are found, we can be confident they were caused by preexisting differences.