(a) Reorganize the data to get a 3 x 2 x 2 contingency table containing Level, Male, and LD and present the table using functions xtabs and ftable. 3 pts (b) Calculate the observed conditional odds ratios giving the effectiveness of reduc- ing lane departure occurrence for males compared to females given each level of RDAS-HC system and compare the conditional odds ratios to the marginal odds ratio between Male and LD. Present these using a nice table (Hint: you may need to use the tapply function). [7 pts] (c) Use the Cochran-Maentel-Haenszel method to test for conditional indepen dence of gender and lane departure, given the level of RDAS-HC. [5 pts] (d) Give a 95% confidence interval for the common odds ratio based on the CMH method. [5 pts]