Who what you where what how?!!? sus impostor pig 300

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?

If a is a nonzero real number then the reciprocal of a is

What is the 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83