Brazilian fire ants have recently invaded Texas woodlands and grasslands. Scient

Question

Brazilian fire ants have recently invaded Texas woodlands and grasslands. Scientists studied whether the fire ants impacted the structure of native ant communities. They set up pitfall traps to catch ants in sites that were either “infested” with fire ants or “uninfested.” Consider the following figure:

5) What do the observed differences in bar height for species richness represent?

a) site to site variability

b) effects of invasive ants

c) site to site variability and effects of invasive ants

d) cannot be determined

6) What is the main conclusion of this study?

a) invasive ants reduce species richness and number of native ants

b) native ants reduce species richness and number of invasive ants

c) invasive ants are not very abundant relative to native ants

d) invasive and native ants do not appear to interact significantly

7) What statistical test would be most appropriate for evaluating this conclusion?

a) Correlation   

b) regression

c) chi-square

d) ANOVA

8) Which of the following is NOT an assumption of this type of analysis?

a) means are equal

b) variances are equal

c) data are normally distributed

d) data are independent

Explanation / Answer

5) it determines both site to site variability and effects of invasive ants because these two factors has ben plotted on the graph and are the topic of concerned study

6) b is the right answer because infected sites are increasing it means that the new species has been overruled

7)correlation is the answer because we have to find whether the infected sites is correlated to a specific species

8) data is independent , because if data is independent than what is the need of doing correlation test

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