Correctly that the treatment and control groups do not differ with respect to outcome.   That the treatment and control groups do not differ with respect to outcome when in fact they do.   That you don’t have sufficient information to present results.

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The α level in the context of reporting findings from a randomized controlled trial corresponds to the probability of concluding:

Correctly that the treatment and control groups differ with respect to risk of outcome.
 
That the treatment and control groups differ with respect to outcome when in fact they do not.
 
Correctly that the treatment and control groups do not differ with respect to outcome.
 
That the treatment and control groups do not differ with respect to outcome when in fact they do.
 
That you don’t have sufficient information to present results.
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