11. Deep-Sea Research Manganese nodules are mineral-

rich concoctions found abundantly on the deep-

sea floor.10 A research report relates the magnetic age of the earth’s crust to the “probability of finding manganese nodules,” giving the number of samples of the earth’s core and the percentage of those that contain manganese nodules for each of a set of magnetic-crust ages. Do the data provide sufficient evidence to indicate that the probability of finding manganese nodules in the deepsea earth’s crust is dependent on the magnetic-age classification?

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Age Number of Samples Percentage with Nodules Miocene-recent 389 5.9 Oligocene 140 17.9 Eocene 214 16.4 Paleocene 84 21.4 Late Cretaceous 247 21.1 Early and Middle Cretaceous 1120 14.2 Jurassic 99 11.0