12.1.3 quiz: what is a function? question 7 of 10 2 ports the amount of time it takes to complete a reading assignment might be a function of which of the following? o a. the cost of the book o b. the year the book was published o c. the number of pages in the assignment

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?