BME423_HW2

BME423_HW2 - BME 423 HOMEWORK #2 Due before class Wednesday...

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BME 423 HOMEWORK #2 Due before class Wednesday October 14, 2009 For this homework, please use the Yates correction whenever appropriate . 1. Methods for Proportions and Nominal Variables (part 1) Clifton et al. (1993) conducted a study to determine whether moderate hypothermia has a protective effect in the treatment of severe brain injury. The authors report the number of patients in their study who developed seizures after the standard treatment (no hypothermia) and after treatment that included hypothermia (the data have been adapted): Table 1 Treatment Seizures No seizures Hypothermia 0 72 Standard treatment 15 51 a) Based on Table 1, is there a statistically significant difference in the number of seizures between patients treated with and without hypothermia? To find the answer, use: I. The z statistic I I. The χ 2 statistic b) Table 2 gives the results of a smaller study with exactly the same proportions as Table 1. Would you have been able to use the z statistic or the χ 2 statistic for the results in Table 2? How did you determine this? Hint: look at p. 138 & 151 in your textbook. Table 2 Treatment Seizures No seizures Hypothermia 0 24 Standard treatment 5 17 2. Methods for Proportions and Nominal Variables (part 2) A retrospective study examined the risk of suicide in severely depressed patients after
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This note was uploaded on 10/13/2009 for the course BME 423 at USC.

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BME423_HW2 - BME 423 HOMEWORK #2 Due before class Wednesday...

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