Fifty migraine patients are randomly selected from hospital records. Half of the patients are told to drink ice water and sit in the dark when they next experience a migraine; the remaining patients are told to use neither of these possible remedies. Participants then report back as to relief, if any. Serious faults of this experimental design include which of the following? * I. Lack of Randomization. II. Probably confounding variables.II. Lack of blinding a) I only b) II only C) II only d) I and II e) I and II

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