Which of the following would be classed as a two-tailed hypothesis?
A) The training intervention will evoke a change in aerobic capacity.
B) The training intervention will result in a decrease in aerobic capacity.
C) The training intervention will result in an increase in aerobic capacity.
D) The training intervention will result in a significant increase in aerobic capacity.

Question

Quizplus · Accepted Answer

A two-tailed hypothesis is one where the researcher is not making a specific directional prediction (e.g. increase or decrease). In this case, option A is non-directional, indicating that the training intervention will have an effect on aerobic capacity, without specifying if it will be an increase or a decrease. The other options make specific directional predictions, and so are not considered two-tailed hypotheses.

Which of the Following Would Be Classed as a Two-Tailed