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Chi-square for 2X2 contingency table: Hemorrhaging Rates

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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. Use a nondirectional alternative and let alpha = .05.

Treatment
Ancrod Placebo
Hemorrhage? Yes 13 5
No 235 247
Total 248 252

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Chi-square for 2x2 contingency tables are examined for hemorrhaging rates.

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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. Use a no directional ...

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