Select ALL that apply In an observational study data is recorded without purposefully trying to influence the variables the

Question

Select ALL that apply In an observational study data is recorded without purposefully trying to influence the variables the individuals are blinded to the study variables the explanatory variables are imposed conditions assigned at random the explanatory variables are confounded with other variables such as the real life reasons for their occurrence there are not enough variables recorded to reach a conclusion about causation that would be informative lurking variables are not imposed and therefore have no obvious effect on the recorded variables no comparisons are made between groups or types of individuals

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