Which one of the following statements is/are true or false regarding cohort and case-control studies? (I) Case-control studies are controlled experiments, whilst cohort studies are observational studies. (II) Case-control studies are better for rare diseases, compared to cohort studies.

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Q: Is the study an experiment or an observational study ? How do you know?

A: It is an important part of statistics. It is widely used.

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Q: The primary difference between an experimental and observational study is:

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Q: Which uses a group of people with different exposures and follows them over time?     Cohort…

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A: Given information: The data represents the scores of attitudes before and after the unpleasant task.

Q: Is this study experimental or observational? Justify.

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A: Given that, Which of the following Research questions utilizes one-sample z-test as Test Statistics

Q: Which type of observational study is described in the problem statement?

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Q: #2...Can you write out answer please n thank u

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Q: 13. What is the Relative Risk for these data?

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A: The null and the alternative hypotheses are, Test statistic: R-Code: Output: