l. 4.72 Concussions and Brain Size. In this exercise, we test for evidence that average brain size is larger in football players who have never had a concussion (FBNOC'oncus-s) than in football players with a history of concussions (FBConcuss). The variable Hipp measures brain size as the volume of the hippocampus (iuluL) for each subject. Uploading the le FootballBrain is not recommended for this problem. You can nd the data in the dropdown menu, as Brain Size (Foutball:Nu Concussion vs. Concussion). a. Define the parameter(s) for this question, using appropriate notation. b. Write the null and alternative hypotheses in terms of the parameter(s) above. c. Use StatKey to nd the value of the relevant sample statistic. Write it using correct notation. d. Use StatKey to nd the pivalue for your hypotheses. Include a screenshot of the randomization dot plot with tail area with your homework submission and write the p-value here. e. State the conclusion of the test in context, using nontechnical language. Include wording to indicate the strength of the evidence against H0. f. Assuming there is a signicant difference, can we conclude from this study that concussions cause the differences we see in brain size? Justify your answer based on the methodology of the study