Janice is participating in an experimental study of an herbal supplement that supposedly gives users more energy.Since starting the experiment,she has noticed that she has more energy,but in reality,she is just receiving a "blank" pill that does not contain the herbal supplement.What effect is Janice demonstrating?
A) false negative
B) type I error
C) type II error
D) placebo
Correct Answer:
Verified
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A)is
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