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. 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 95% confidence interval for the difference between the two means?

A) -0.017 < m₁ - m₂ < 0.617
B) -0.004 < m₁ - m₂ < 0.604
C) 0.003 < m₁ - m₂ < 0.597
D) 0.013 < m₁ - m₂ < 0.587