Hello,
I'm working on a study that consists in evaluating to what extent an event impacts the perception of a brand.
Basically, the idea is to evaluate this perception, to present the respondents with an event, and then to see to what extent this perception evolves.
2 possibilities:
- I do a within subjects study: we keep the same people between the two questionnaires (before & after the event)... but as we have to wait one or 2 weeks between the 2 steps, I can't know how many people should be interviewed in the first one (I don't know how many will be there in the 2nd round)
- A between subject study. This allows me to reduce the number of interviewees, to save time, to control the number of respondents & therefore to reduce the collection costs. The idea would be to randomly assign each respondent to one of the 2 situations; without the event in question, or after this event. If the 2 populations are identical in terms of profile, this would allow a comparison.
I have never seen a study of this type done in a between subjects setting, do you have any references? If it has already been done!
Thank you.
ps: Sorry for the English mistakes