A randomized trial comparing the efficacy of two drugs showed a difference between the two (with a P value < 0.05). Assume that in reality, however, the two drugs do not differ. This is therefore an example of:
a. Type I error (α error)
b. Type II error (β error)
c. 1 − α
d. 1 − β
e. None of the above
Answer: a. Type I error (α error)