Conservation efforts include reintroduction of species into the wild from captive breeding programs. Leung et al. (2018) “rewilded” mice from the inbred laboratory strain of mouse, C57BL/6, that had been infected with the intestinal nematode parasite, Heligmosomoides polygyrus. Rewilded mice were released into outdoor fenced enclosures, whereas control mice were kept in the lab. After 3 weeks, the researchers compared the nematode burdens of mice in the two groups. The data are below, in log₁₀ units of total nematode biomass per individual mouse (measured in nanograms)

a. Examine the graph of these data. Do these data seem to fit the assumptions needed to calculate the confidence interval of the difference in means?

b. What type of graph is this?

c. Compute the mean nematode burdens in the two groups of mice. Which group seems to have the higher burden?

d. Calculate a 95% confidence interval for the difference in these groups’ mean nematode burdens.

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Rewilded mice: 3.50,3.50, 2.64.2.64, 2.86,2.86, 3.00,3.00, 2.85,2.85, 3.29.3.29, 2.87, 2.87, 3.18.3.18, 2.64,2.64, 3.603.60 Lab control mice: 1.20,1.20, 1.92,1.92, 0.90,0.90, 0.30,0.30, 0.78,0.78, 0.000.00