Question: given: m∠aec = 104° and m∠cbd = 31°, explain why angles ace, acb and bcd have a sum of 180°. use the transversal (line gf) as the basis for your argument.

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