Two essential features of all statistically designed experiments are a. Comparing several treatments; using the double-blind method.
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Two essential features of all statistically designed experiments are
a. Comparing several treatments; using the double-blind method.
b. Comparing several treatments; using chance to assign subjects to treatments.
c. Always having a placebo group; using the double-blind method.
d. Using a block design; using chance to assign subjects to treatments.
e. using enough subjects; always having a control group.
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