00:01
So in looking at your problem, it asks you why is this an experiment and not an observational study? well, they are imposing or giving, they're imposing a treatment.
00:17
And it says for this experiment, clearly label the subjects.
00:22
Well, the subjects are the, let me count the number again, 728 older men and women, 728 men and women.
00:33
And they give some conditions on those, which i'll leave for you to do.
00:37
And says two, what are the factors? well, we're, we're getting either a medication or a placebo.
00:44
So the factor is the, um, the supplement, the folic acid supplement.
00:57
And it asks for the levels of the factor.
01:00
Well, there are two, they either get, uh, let's see how many they either get 800 micrograms or nothing...