Rflaig1129841
18.10.2020 •
Mathematics
What are the disadvantages of a cohort study?
a. they are the most powerful of the observational studies when they are practical to do
b. they are expensive
c. they are time consuming and many participants drop out
d. participants are required to recall information and are not always truthful
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Ответ:
A is rational
B is irrational
Product of a and b is irrational.