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An environmental studies student working on an independent research project was investigating metal contamination in the St. Lawrence River. The metals can accumulate in organisms that live in the river (known as bioaccumulation). He collected samples of Quagga mussels at three sites in the St. Lawrence River and measured the concentration of copper (in micrograms per gram,

or mcg/g) in the mussels. His data are summarized in the provided table and plot. He wants to know if there are any significant differences in mean copper concentration among the three sites

-Use the summary information and results from the ANOVA to construct 95% confidence intervals for the differences in each pair of means:
(a) Site 1 and Site 2
(b) Site 1 and Site 3
(c) Site 2 and Site 3
In each case, round the margin of error to two decimal places. Based on your work, which sites have significantly different means? Briefly justify your answer.
Because this confidence interval contains 0, there is no evidence that Sites 2 and 3 have significantly different mean concentrations of copper.

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