9. (8 points) The drug ancrod was tested in a double-blind clinical trial in which subjects who had strokes were randomly assigned to get either ancrod, an approved existing drug or a placebo. One response variable in the study was whether or not a subject experienced intracranial hemorrhaging. (a) (2 pts) 'Ib test whether the difference in hemorrhaging rates is statistically significant. State null and alternative hypothesis. (b) (2 pts) Fill the expected value in the table. Bound to four decimal places. (c) (2 pts) Using chi-square test, what is your test statistic X2? (d) [2 pts) What is the degree of freedom of this test statistic