Use the Following Sample Data to Answer the Next Questions

Short Answer

Use the following sample data to answer the next questions. Biologists
studying the re-forestation of two species of tropical trees in Brazil's Atlantic forest
examined the number of trees that survived based on whether they were planted at
a mine site or at a railroad embankment. Using a .05 significance level, test the
claim that whether a tree survives at a mine site or at a railroad embankment is
independent of the species of the tree.

-Identify the critical value.