Question: In a non-experimental analysis, omission of a relevant control variable A.can bias an estimate of an effect only to be lower than it truly is
In a non-experimental analysis, omission of a relevant control variable A.can bias an estimate of an effect only to be lower than it truly is B.can bias an estimate of an effect only to be higher than it truly is C.can bias an estimate of an effect to be lower than or higher than it truly is D.cannot bias an estimate
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