John rejected his null hypothesis in a right-tailed test for a mean at α = .025 because his critical t value was 2.000 and his calculated t value was 2.345. We can be sure that:
A)John did not commit a Type I error.
B)John did not commit a Type II error.
C)John committed neither a Type I nor Type II error.
D)John committed both a Type I and a Type II error.

Question

Quizplus · Accepted Answer

John did not commit a Type II error because he rejected the null hypothesis when his calculated t value was greater than the critical t value, indicating that the data provides enough evidence against the null hypothesis. A Type II error would occur if he failed to reject a false null hypothesis, which is not the case here.

John Rejected His Null Hypothesis in a Right-Tailed Test for a Mean