A one-tailed sign test is used to test for differences between two populations at the 0.10 level of significance. There were 9 pluses and 5 minuses. What is the decision regarding the null hypothesis?
A) Fail to reject the null hypothesis.
B) Reject the null hypothesis.
C) Neither reject nor fail to reject the null hypothesis.
D) Should have used a paired t-test.

Question

Quizplus · Accepted Answer

The critical value for a one-tailed sign test at the 0.10 level of significance with 14 trials (9 pluses and 5 minuses) is 4. Since the number of minuses (5) is greater than the critical value, we fail to reject the null hypothesis.

A One-Tailed Sign Test Is Used to Test for Differences