Reducing noise by making experimental conditions constant is always a good practice when designing experiments.
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Q31: Control groups in clinical trials are always
Q32: A well-designed study will have only one
Q33: Randomization should never be carried out by
Q34: Assigning experimental units to each treatment alphabetically
Q35: Experiments with humans should be double-blind, but
Q37: For a given total sample size, a
Q38: Randomized block design uses three or more
Q39: When factors interact, that is because we
Q40: We use matching in observational studies to
Q41: With matching, every individual in the treatment
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