Aschool offers four extra curricular activities: band, yearbook, basketball, and art. if two students choose randomly, what is the probability that they both end up on the yearbook staff?

How do i do this activity, is appreciated

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?

Піf x = y and y= z, which statement must be true? оа. -x = -2 b. x= z ос. —x = 2 od. 2= x