Consider the following figure with congruent sides shown by tick marks. Match the additional congruent sides or angle needed to prove that the triangles are congruent by each specified method.

Options
line AC congruent to line DF

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?