Henrietta has 5 hours to complete her 4 chores. How many hours does she have to do each chore? Choose the correct answer from the choices below.

3⁄4 hours per chore

2 hours per chore

1 1⁄4 hours per chore

1 3⁄4 hours per chore

1 hour per chore

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?