10.40 A study was conducted by the Florida Game and Fish Commission to assess the amounts of chemical residues found in the brain tissue of brown pelicans. For DDT, random sample of juveniles and nestlings gave the following results (measurements in parts per million):

Test the hypothesis that there is no difference between mean amounts of DDT found in juveniles and nestlings versus the alternative that the juveniles have a larger mean amount. Use . (This test has important implications regarding the build-up of DDT over time.)

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Juveniles n = 10 = 0.041 S = 0.017 Nestlings n2 = 13 2 = 0.026 $2 = 0.016