Hi, can u help me ?
it's college level but I'm French and I don't understand what to do
;-;

I’m stuck on this equation, anyone got the answer?

Which of the following is the major negative aspect of crossover designs for research studies? a. prohibitive cost b. residual effects c-subject drepout d. incomplete randomization e. large sample size required

What are linear equations? could'ya explain too me, ? ! and how do you see what graph is a proportional relationship?