STAT 371 Midterm: STAT 371 UW Madison Exam5
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Researchers who study bats are interested in the the distance a speci c species of bats in a certain location must y to feed. In an experiment, twenty- ve male bats and twenty- ve female bats are tagged and tracked by radio. You may treat these samples as having been randomly selected from the very large populations of all male and female bats of this species in this location. For each sampled bat, the average distance (in meters) of a feeding pass is measured. One possible explanation for larger mean distances for females is that the males are more aggressive and drive the females away from the nearby feeding areas. Please answer the rst two problems on the back of the page. (a) construct a 95% con dence interval for the di erence between the two population mean distances (female minus male) per feeding pass.
