Consider an Urban Ecologist Who Is Interested in Whether the Presence

question 25

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 standard error of the difference between the two means?

• A) 0.142
• B) 0.145
• C) 0.148
• D) 0.151

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