Question: Assume that an ecologist is studying the effects of the insecticide DDT on wild birds in Sumatra. DDT sprayed on insects and vegetation subsequently eaten by female birds seems to affect the thickness of their eggshells and thus affects the protection of the

embryonic birds. Assume the ecologist knows that the mean eggshell thickness in untreated birds (birds that have not eaten matter sprayed with DDT) is 330 microns and

the variance is 2500 microns squared. Assume also that the thickness follow a normal

distribution.

The ecologist takes a sample of 16 eggshells and finds a sample mean of 290. The ecologist is interested in seeing if the spraying of DDT has any effect on the

eggshells. (a = .05 )

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