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Tag Archives: Randomization

Factorial Designs


In this section we will describe the completely randomized factorial design. This design is commonly used when there are two or more factors of interest. Recall, in particular, the difference between an observational study and a designed experiment. Observational studies involve simply observing characteristics and taking measurements, as in a sample survey. A designed experiment […]

Evaluate The Article About Therapy (Randomized Trials)


Section 1 How Serious Is The Risk of Bias? Did Intervention and Control Groups Start With The Same Prognosis? Consider the question of whether hospital care prolongs life. A study finds that more sick people die in the hospital than in the community. We would easily reject the naive conclusion that hospital care kills people […]