Problem

Refer to the Minitab output of Exercise 20, in which x = NO3– wet deposition and y = li...

Refer to the Minitab output of Exercise 20, in which x = NO3wet deposition and y = lichen N (%).

a. Carry out the model utility test at level .01, using the rejection region approach.

b. Repeat part (a) using the P-value approach.

c. Suppose it had previously been believed that when NO3wet deposition increases by .1 g N/m2, the associated change in expected lichen N is at least .15%. Carry out a test of hypotheses at level .01 to decide whether the data contradicts this prior belief.

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