Question

You are interested in assessing the overall effect of the using Corexit as a cleanup method on the intertidal sessile flora and fauna community separately using data collected from an experiment conducted after the Exxon Valdez oil spill (Table 2). Provide an appropriate graph to describe the data, include a figure caption and include a summary paragraph describing the figure provided. (Follow the CSE guideline format)

Table 2 Change in the % cover of dominant algae and sessile invertebrates on heavily oiled cobble beaches in Prince William Sound before and after tests of the effect of Corexit on the benthic intertidal community. Data modified from Peterson (2001).

% cover	Before			After
	Site 1	Site 2	Site 3	Site 1	Site 2	Site 3
Algae	4.4	31.2	5.2	0.13	4.8	1.6
Sessile invertebrates	10.2	12.1	18.9	4.9	6.5	7.2

Answer 1

Result:

Table 2 Change in the % cover of dominant algae and sessile invertebrates on heavily oiled cobble beaches in Prince William Sound before and after tests of the effect of Corexit on the benthic intertidal community. Data modified from Peterson (2001).

Average Change in the % cover

	Before	After	average
Algae	13.6	2.18	7.89
Sessile invertebrates	13.73	6.2	9.965
Average	13.665	4.19

Before the test, there is no difference between Algae and Sessile invertebrates. After the test, there is more decrease in Algae than Sessile invertebrates.