The drug ancrod was tested in a double-blind clinical trial in which subjects who had strokes were randomly assigned to get either ancrod or a placebo. One response variable in the study was whether or not a subject experienced intracranial hemorrhaging. The data are provided in the following table. Use a chi-square test to determine whether the difference in hemorrhaging rates is statistically significant following the five steps (a-e) in Exercise 10.2.4. Use a non directional alternative and let α = 0.05.

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Treatment Ancrod Placebo Hemorrhage? Yes 13 No 235 247 Total 248 252