Pls help me again pls

What is the slope simplify your answer and write it as a proper fraction, improper fraction, or integer

Issof claims that the scale factor is 1/2. which statement about his claim is correct

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?