Hi,
I am looking at doing a shelf facing display cbc for the first time and wondered if anyone had any advice on the maximum number of items and number of tasks a respondent can handle?
I have around 70 items in total and was thinking of showing 30 items per task. I was hoping for around 5 tasks per respondent but even with 6 when I used the advanced test I was getting se's of 0.06-0.07 which is above the recommended 0.05 (base of 3000 respondents).
Should I increase the number of tasks (6 already feels a little much) or increase the number of items displayed at once or live with those se's? Any advice welcome!
Many thanks
Jef