If a researcher were to conduct 100 experiments, and in each case the null hypothesis were rejected at an alpha of .05, then
A) chances are that 5% of the decisions were incorrect
B) chances are that 95% of the decisions were incorrect
C) chances are that less than 5% of the decisions were correct
D) none of these, since null can never be rejected 100 times in a row

Question

Quizplus · Accepted Answer

An alpha of .05 means there is a 5% chance of incorrectly rejecting the null hypothesis (Type I error) in each experiment. Therefore, if the null hypothesis is rejected in all 100 experiments, it is expected that about 5% of those rejections (or 5 out of 100) would be incorrect due to chance.

If a Researcher Were to Conduct 100 Experiments, and in Each