14.32 Deep-Sea Research W.W. Menard has conducted research involving manganese nodules, a mineral-rich concoction found abundantly on the deep- sea floor. In one portion of his report, Menard provides data relating the magnetic age of the earth's crust to the "probability of finding manganese nodules." The table gives 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 pro- vide sufficient evidence to indicate that the probability of finding manganese nodules in the deep-sea earth's crust is dependent on the magnetic-age classification?

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Number of Percentage with Age Samples 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