In a conventional experiment, you get people into a lab to do the experiment. Naturally this limits who can take part and the number of people. Often researchers end up using psychology students to take part in their experiments for this reason, which has it’s own issues.
Well done for pointing out this is an issue, for excluding people who choose not to use the internet. It is unfortunate, but it’s practical given my resources to overcome it. It also excludes people who can’t read English, for example.
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