Question: A topic of recent clinical interest is the possibility of using drugs to reduce infarct size in patients who have had a myocardial infarction within the past 24 hours. Suppose we know that in untreated patients the mean infarct size is 25 with a standard deviation of 10. In 8 patients treated with the drug, the mean infarct size is 16. Is the drug effective in changing the infarct size?