To estimate the number of foxes m an area, a researcher conducted a mark-recapture survey. In the fast survey, he caught and marked 90 foxes. In his second survey a week later, he caught 120 foxes of which 40 were marked (recaptures). If you are told that the actual number of foxes in this area is 400, which of the following is a plausible explanation for the anomaly in the researcher's data? 

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#Question id: 11512

#Section 2: Evolution

The mortality rate of organisms following a type iii survivorship curve is

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#Question id: 10572

#Section 1: Ecology

In 2005, the United States had a population of approximately 295,000,000 people. If the birth rate was 13 births for every 1,000 people, approximately how many births occurred in the United States in 2005?

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#Question id: 16884

#Section 3: Mathematics and Quantitative Ecology

A prospective observational study on the relationship between sleep deprivation and heart disease was done by Ayas, et. al. (Arch Intern Med 2003). Women who slept at most 5 hours a night were compared to women who slept for 8 hours a night (reference group). After adjusting for potential confounding variables like smoking, a 95% confidence interval for the relative risk of heart disease was (1.10, 1.92). Based on this confidence interval, a consistent conclusion would be

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#Question id: 11502

#Section 2: Evolution

Which of these statements is false and therefore does not support the hypothesis that certain eukaryotic organelles originated as bacterial endosymbionts? Such organelles

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#Question id: 16890

#Section 3: Mathematics and Quantitative Ecology

A test of H0: μ = 0 versus Ha: μ > 0 is conducted on the same population independently by two different researchers. They both use the same sample size and the same value of α = 0.05. Which of the following will be the same for both researchers?