This may be a silly question but I am new to quantitative psychology experiments! I am looking to conduct an experiment which uses stimuli from 4 different groups of people. These will then be used in 3 blocks (a different question is asked of the same stimuli for each block). Is there a way to determine the number of stimuli that should used from each group for the experiment to be valid?
There are statistical power estimators online that will help. In general, to answer the question we'd need to know a bit more about the experiment, including how many conditions there were. Then we could determine a basic number and potentially the number of replications per stimulus.
An old (and not entirely valid) rule of thumb was 20-30 people per condition (i.e., per 'cell' in the analyses), but that's just a basic rule of thumb.
Thank you your answer. There are three groups (late diagnosed ASC individuals, early diagnosed ASC individuals, and neurotypicals. Each will produce a 5sec film which will be used as stimuli. There will then be 3 blocks whereby a separate group rate these videos on three different factors (one per block). I hope that makes sense!
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