Nine percent of the control group that received a fake treatment in a trial of a new arthritis medication said they had decreased pain

• blinding
• confounding
• non-response bias
• placebo effect
• response bias
• selection bias

7.c

1 point(s)

In a trial of a new sleeping medication intended to increase sleep time, the amount of coffee each patient consumed daily was also recorded

• blinding
• confounding
• non-response bias
• placebo effect
• response bias
• selection bias