Use the following to answer the questions below:
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, μg/g 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.

-Are the conditions for using ANOVA reasonably satisfied?

Question

Use the following to answer the questions below:
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, μg/g 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. 
 
-Are the conditions for using ANOVA reasonably satisfied?

Quizplus · Accepted Answer

Yes. The boxplots indicate that the data for all groups is reasonably symmetric and without outliers. The standard deviation for each group is not more than twice the standard deviation for another group.

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