MicroExam 2 (HAB solutions)

# MicroExam 2(HAB - Micro-Exam 2 Solutions ESM 206B Winter 2008 In class we looked at the relationship between a countrys"invadedness(measured as the

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Micro-Exam 2 Solutions ESM 206B Winter 2008 In class, we looked at the relationship between a country’s “invadedness” (measured as the fraction of plant species in the country that are exotic – “Prop_exotic” in ExoticSpecies.xls) and the human population density. Now we are going to look at another possible socioeconomic factor that might influence biological invasions: per- capita gross domestic product (“GDP” in ExoticSpecies.xls). 1. (15 points) Do you expect that GDP might affect the proportion of species in a country that are exotic? Why or why not? If so, what do you expect the relationship to look like? (answer this before you look at the data) I would expect GDP to have a positive effect on the proportion of species that are exotic for a particular country. One potential factor causing this relationship is that countries that are wealthier have more money to spend on imported goods, which are sources of exotic species. Also, wealthier countries have a higher proportion of people who have the money to travel around the world, which is also a source of exotic species. I am not sure whether or not this relationship should be linear. 2. (10 points) What is the linear correlation between the proportion of exotic species and the per-capita GDP? r xy = 0.643 The correlation between the proportion of exotic species and the per-capita GDP is 0.643. The correlation is positive, which means that countries with higher GDP tend to also have a higher proportion of exotic species. The value of 0.643 (the maximum

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## This note was uploaded on 08/06/2008 for the course ESM 206 taught by Professor Kendall,berkley during the Spring '08 term at UCSB.

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MicroExam 2(HAB - Micro-Exam 2 Solutions ESM 206B Winter 2008 In class we looked at the relationship between a countrys"invadedness(measured as the

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