43 What is/are the independent variable(s)? 44 What is/are the dependent variabl

Question

43 What is/are the independent variable(s)?

44 What is/are the dependent variable(s)?

45 What do the letters A-E represent?

46 What was the maximum observed value for species richness among infested sites?

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

48 What is the main conclusion of this study?

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

50. Which of the following is NOT an assumption of this type of analysis?

Explanation / Answer

43. Independent variables are “uninfected sites” and “infected sites”, the variables present on x-axis.

44. Dependent variables are “all ants combined”, “native ants only” and “species richness”, the variables present on y-axis.

45. A-E represents site names.

46. The maximum observed value for species richness among infested sites is 8 in sites A and C.

47. Species richness is the number of different species represented in an ecological site. The observed differences in bar height for species richness represents how many additional numbers of species are present at one site compare to another.

48.

a) It is clear from the figure species richness that number of species present in uninfected site is more.

b) Number of native ants (in hundred’s) gathered at infected sites is very low compared to total number of ants (in thousand’s) and number of different species present at infected is less.

c) The main conclusion of this study are

Case 1: Number of native species are effected less due to decrease in fire ant by assuming native is much bigger than numbers shown in uninfected plots.

Case 2: If uninfected plots approximately represents the maximum population of the native species then species are getting effected (in ten’s).

49. Correlation tests (correlational, Pearson correlation, Spearman correlation and Chi-square etc.,) are more suitable to evaluate the statistical conclusions.

50. Some of tests does not reply on the assumption of normally distributed data.

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