Question

To test the effects of acid rain on the growth of white pine trees, a conservationist measures the diameters in centimeters of 200 white pines in the Allegheny National Forest in northwest Pennsylvania. The mean diameter of the sampled trees is 23.42 cm. Suppose the conservtionist wants to see whether the sample provides sufficient evidence to conclude that the current mean diameter of the white pines is less than that recorded 50 years ago (μ = 24.8cm) if the population standard deviation is 6cm? What is the p-value and the correct decision for this test at the 5% level of significance.

a. p-value = 0.9994, Do not Reject Ho

b. p-value = 0.0006, Do not Reject Ho

c. p-value = 0.0006, Reject Ho

d. p-value = 0.9994, Reject Ho

Answer 1