Example: A researcher claims that the stomachs of blue crabs from Location A contain more fish than

the stomachs of blue crabs from Location B. The stomach contents of a sample of 25 blue crabs from

Location A contain a mean of 320 milligrams of fish and a standard deviation of 60 milligrams. The

stomach contents of a sample of 15 blue crabs from Location B contain a mean of 280 milligrams of fish

and a standard deviation of 80 milligrams. At

=0.01,

can you support the researcher's claim? Assume

the population variances are equal.