Given a test statistic of t=2.315 of a left tailed test with n=8

Answer this question only if you know the 30 points and

Tom drove 206 miles in 3.9 hours. estimate his average speed.

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