Assuming that the null hypothesis is true, how likely does it have to be for a sample mean to be observed before a researcher can make the decision to reject the null hypothesis?
A) 1%
B) 5%
C) 0.1%
D) 10%

Question

Quizplus · Accepted Answer

The standard significance level for hypothesis testing is 0.05, or 5%. This means that if the probability of obtaining a sample mean as extreme or more extreme than the one observed is less than 5% assuming the null hypothesis is true, we reject the null hypothesis. Therefore, the best choice is B.

Assuming That the Null Hypothesis Is True, How Likely Does