If a researcher rejects a null hypothesis when that hypothes
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 | 

