Each Brand Lift collects enough respondents to properly assess the performance of a campaign — specifically 250 ad recallers and 250 respondents in the control group. This number is guaranteed regardless of how the campaign performs.
These thresholds have been established according to the acceptable error margin for a Brand Lift study. To help you interpret your results correctly, keep the following simple guidelines in mind:
With fewer than 50 respondents per pool, we recommend avoiding any conclusions, as the sample is too limited.
With 50 to 80 respondents, results can be interpreted as trends, offering directional insights rather than definitive conclusions.
With 80 or more respondents per target, the results are considered solid and statistically reliable.
This is why 250 ad recallers are more than sufficient for a Brand Lift. However, if you wish to increase your sample size, you can add more respondents to your Brand Lift.