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cupoosta [38]
3 years ago
8

A study showed that people who take a B12 vitamin daily have a significantly better chance of protecting against Alzheimer's dis

ease than those who did not take the vitamin daily. Which of the following statements is/are correct?
I. This study provides evidence that taking a B12 vitamin daily contributes to protecting against Alzheimer's disease.
II. The general health consciousness of people who take B12 vitamins could be a confounding variable.
III. This is an observational study and not an experiment.
a. l only
b. III only
c. l and II only
d. ll and III only
e. I, II, and III
Mathematics
1 answer:
marishachu [46]3 years ago
3 0
A. 1 only- this study provides evidence that taking B12 vitamin daily contributed to protecting against Alzheimer’s disease.
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