In a study of the effects of exercise on stress,researchers predict simply that there will be a difference in stress level between the exercise and no exercise groups.The researchers are using a _____ hypothesis.
A)two-tailed
B)directional
C)one-tailed
D)one-tailed and directional

Question

Quizplus · Accepted Answer

A two-tailed hypothesis predicts that there will be a difference between groups but does not specify the direction of the difference.

In a Study of the Effects of Exercise on Stress,researchers