9.12 Invasive Species In a study of the pernicious giant hogweed, Jan Pergl' and associates compared the density of these plants in two different sites within the Caucasus region of Russia. In its native area, the aver- age density was found to be 5 plants/m. In an invaded area in the Czech Republic, a sample of n = 50 plants produced an average density of 11.17 plants/m with a standard deviation of 3.9 plants/m2. a. Does the invaded area in the Czech Republic have an average density of giant hogweed that is different from u = 5 at the a = 0.05 level of significance? b. What is the p-value associated with the test in part a? Can you reject Ho at the 5% level of significance using the p-value? NEL