6..3.2. Efforts to find a genetic explanarion for why cenain people are right-handed and
others left-handed have been largely unsuccessful. ReJiab]e data are difficult to find because of environmental factors that also influence a child's "handedness." To avoid that complica tion, researchers often study the analogous problem of "pawedness" in animals, where both genotypes and the environmen t can be partially con trolled. In one such experiment (28), mice were pu t into a cage having a feeding tube that was equally accessible from the right or the lef t. Each mouse was then carefully watched over a number of feedings. If it used its right paw more than half the time to activate the tube, it was defined ro be "right-pawed. Observations of this son: showed that 67% of mice
belonging co strain AJJ are right-pawed. A similar protocol was followed on a sample of
35 mke belonging to strain AJHeJ. Of those 35, a total of 18 were eventually classified as right-pawed. Test whether the proportion of right-pawed tnice found in the NHe.J sample was significan tly different from what was known about the NJ strain. Use a two-sided alternative and Jet 0.05 be the probability associated with the critical region.
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