The feeding habits of two species of net-casting spiders are studied. The species, the deinopis and menneus, coexist in eastern Australia. The following data were obtained on the size, in millimeters, of the prey of random samples of the two species: Deinopsis 12.9 10.2 7.4 7.0 10.5 11.9 7.1 9.9 14.4 11.3 Menneus 10.2 6.9 10.9 11.0 10.1 5.3 7.5 10.3 9.2 8.8 What is the difference, if any, in the mean size of the prey (of the entire populations) of the two species? [Hint: Find the 95% confidence interval for the difference in the two population means.]

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