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If a researcher rejects a null hypothesis when that hypothesis is actually true, he has committed:
a type I error
a type II error
a type III error
no error
a type I error
a type II error
a type III error
no error
Solution
If a researcher rejects a null hypothesis when that hypothesis is actually true, he has committed:
a type I error
a type II error
a type III error
no error
A type I error is the incorrectly rejecting a true null hypothesis.
a type I error
a type II error
a type III error
no error

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