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Mathematics, 11.10.2019 20:20 destinyleisantos

Astudy showed that people who take a b12 vitamin daily have a significantly better chance of protecting against alzheimer's disease than those who did not take the vitamin daily. which of the following statements is/are correct?

this study provides evidence that taking a b12 vitamin daily contributes to protecting against alzheimer's disease.
the general health consciousness of people who take b12 vitamins could be a confounding variable.
this is an observational study and not an experiment.
i only
iii only
i and ii only
ii and iii only
i, ii, and iii

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