An investigator wants to perform an experimental study on the effectiveness of a new therapy (Therapy A), compared to the current therapy (Therapy B) for breast cancer to prevent metastases. The study sample is 500 female patients aged 18 years or older who are patients with a diagnosis of breast cancer of several clinics and hospitals in Los Angeles County. Which of the following treatment assignment schemes can be used so that the study is properly called a randomized controlled trial? (choose one best answer) The 1st eligible patient will be assigned to one therapy by flipping a coin and all the following patients will be assigned alternatively to the two therapies so that no two consecutive patients will receive the same therapy. Any assignment scheme that makes it impossible to predict what is the therapy that the next patient will receive. Any assignment scheme which guarantees exactly 200 patients assigned to each study group. Any eligible patient admitted on an even-numbered day will be assigned to Th
An investigator wants to perform an experimental study on the effectiveness of a new therapy (Therapy A), compared to the current therapy (Therapy B) for breast cancer to prevent metastases. The study sample is 500 female patients aged 18 years or older who are patients with a diagnosis of breast cancer of several clinics and hospitals in Los Angeles County. Which of the following treatment assignment schemes can be used so that the study is properly called a randomized controlled trial? (choose one best answer) The 1st eligible patient will be assigned to one therapy by flipping a coin and all the following patients will be assigned alternatively to the two therapies so that no two consecutive patients will receive the same therapy. Any assignment scheme that makes it impossible to predict what is the therapy that the next patient will receive. Any assignment scheme which guarantees exactly 200 patients assigned to each study group. Any eligible patient admitted on an even-numbered day will be assigned to Th
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