An author reports the following information about a one-tailed independent-samples t test: t = 1.71, df = 17, p = .111. The sample means were consistent with the research hypothesis. Which of the following is true?
A) The two-tailed significance level must have been .222.
B) The null hypothesis was rejected
C) The two groups were significantly different.
D) All of the above are true.

Question

Quizplus · Accepted Answer

Given the one-tailed p-value is .111, the two-tailed p-value would be double that (assuming a symmetric distribution), hence .222, making option A correct. The null hypothesis is not rejected at common significance levels (e.g., .05) given p = .111, and thus, we cannot conclude the groups were significantly different, making B and C incorrect.

An Author Reports the Following Information About a One-Tailed Independent-Samples