Claimb65a92fd0590e18f1a009cc38214965c198c292f47a495e0e05b9a8483a509c0

Claim

Large sample size does not address selection bias; volunteer samples may systematically differ from non-volunteers in ways that affect treatment response.

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Arguments for (1)

Large sample size does not address selection bias; volunteer samples may systematically differ from non-volunteers in ways that affect treatment response.tested-undermined

Arguments against (1)

Selection bias in volunteer samples would more plausibly bias toward finding effects rather than null effects, because volunteers willing to modify behavior may be more engaged users with greater expountested-default

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