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Consider an urban ecologist who is interested in whether the presence of high-voltage power lines influences the number of eggs laid by birds nearby. He plans to conduct a two-sample t-test and will assume that the population variances are equal. His data are as follows:
Near (group 1) : mean = 6.1, SD = 0.35, n = 9
Far (group 2) : mean = 5.8, SD = 0.30, n = 12
What is the standard error of the difference between the two means?
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