Consider an Urban Ecologist Who Is Interested in Whether the Presence

Multiple Choice

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. She plans to conduct a two-sample t-test and will assume that the population variances are equal. Her data are as follows:
Near (group 1) : mean = 6.1, SD = 0.35, n = 12
Far (group 2) : mean = 5.8, SD = 0.30, n = 9
What is the 95% confidence interval for the difference between the two means?

A) 0.017 < μ₁ - μ₂ < 0.583
B) 0.010 < μ₁ - μ₂ < 0.590
C) 0.003 < μ₁ - μ₂ < 0.597
D) -0.004 < μ₁ - μ₂ < 0.604