Question

Question 2 Which of the following statements is true? Check all that apply. Select all that apply. 10 points A. We can use results from an observational study to test a claim about a population. B. We can use results from an observational study to establish an association between two variables. C. O When an observational study has a large sample and follows people for many years, we can use the results to establish a cause-and-effect relationship between two variables. D. 0 When many observational studies together meet specific criteria, the results can provide varying degrees of evidence for a cause-and-effect relationship between two variables, but we should be cautious in interpreting such results. E. A well-designed experiment is the only legitimate way to establish a cause-and-effect relationship between two variables.

Answer 1

We can use an observational study to answer questions about a given population and establish an association between any two variables of interest. Hence, A and B are true.

We do not manipulate our variables of interest in an observational study, because of this reason it is not effective to check the cause-and-effect relationship between two variables. Hence, C is false.

D is correct as if many observational studies meet the criteria, we can say that there is a cause effect but we should not completely rely on the results obtained, we should be cautious enough. D is true.

E is true as a well designed experiment is the best method to determine a cause and effect relationship

Therefore, ABDE are true