The graph below is of an index of diversity of arthropods in three different plots of a cornfield. In one of the three plots an insecticide was sprayed. Answer the questions below about this situation.
Arthropod diversity in three cornfield plots.
-When and where does it appear that the insecticide was applied?
Definitions:
Independent Samples
Independent samples refer to sets of data collected from distinct, non-overlapping groups or populations, where the performance or measurement in one group does not influence the other.
Population Means
The average values of a particular variable for all individuals within a population.
Pooled-variances T-test
A statistical test applied to compare the means of two independent samples, especially when the two samples have the same variance.
Population Variances
Statistical measures that quantify the degree to which individuals in a population differ from the population mean.
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