Which of the Following Would Be the Best Method for Randomly

Which of the following would be the best method for randomly assigning subjects (n = 40) to treatment (n = 20) and control (n = 20) groups in an intervention study? Assign numbers to all subjects and:

A) ignore numbers; group the subjects by diagnosis or physician.
B) place the first 20 subjects in one group and the last in the other.
C) put even-numbered subjects in one group, odd numbered in the other.
D) put numbers 1 to 40 in a box and blindly draw from the box.

Correct Answer:

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