Question mean-r
| Measure | Mean rating for participants aware of taking a placebo | Mean rating for participants in the control group |
|---|---|---|
| Global improvement | 5.0 | 3.9 |
| Symptom severity reduction | 92.00 | 46.00 |
| Quality of life improvement | 11.4 | 5.4 |
To test whether a mediion is effective, scientists compare outcomes for patients taking it and patients taking a placebo (a medically inactive substance). Patients normally aren’t told they’re receiving a placebo, but a research team conducted a study to see if there might be a medical benefit to telling them. The team used various measures to evaluate participants, with higher ratings indiing greater well-being in each measure. Compared to the mean ratings after 21 days for participants in the control group, the mean ratings for participants who were aware of taking a placebo blank
Which choice most effectively uses data from the table to complete the statement?
ranged from 5.0 to 92.00, indiing that -being varied widely from participant to participant.
were lower for two measures, with the rating for only one measure indiing greater well-being for these participants.
ranged from 3.9 to 46.00, with no rating indiing greater well-being in any measure for these participants.
were higher for all three measures, indiing greater overall well-being for these participants.