The lengths of the sides of the base of a right square pyramid and its slant height are doubled. what is the surface area of the larger pyramid divided by the surface area of the smaller pyramid?
a. 16
b. 8
c. 4
d. 2

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?