The sample size depends on the number of ideas and the number of tasks that each respondent will see.
Deciding principles are:
- Minimum exposure per idea for the screening tasks is 100.
- No consumer reviews more than 2 ideas in detail.
Recommended minimum sample sizes:
|Number of Ideas:||5||10||20||30||40||50|
|Total sample size:||200||375||750||1125||1500||1875|