The article “Genetic Tweak Turns Promiscuous Animals Into Loyal Mates” (Los Angeles Times, June 17, 2004) summarizes the results of a research study that appeared in the June 2004 issue of Nature. In this study, 11 male meadow voles who had a single gene introduced into a specific part of the brain were compared to 20 male meadow voles who did not undergo this genetic manipulation. All of the voles were paired with a receptive female partner for 24 hours. At the end of the 24-hour period, the male was placed in a situation where he could choose either the partner from the previous 24 hours or a different female. The percentage of the time during a 3-hour trial that the male spent with his previous partner was recorded. The accompanying data are approximate values read from a graph that appeared in the Nature article. Do these data support the researchers’ hypothesis that the mean percentage of the time spent with the previous partner is significantly greater for genetically altered voles than for voles that did not have the gene introduced? Test the relevant hypotheses using a = .05.
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