In many parts of the northern United States, two color variants of the Eastern Gray Squirrel— gray and black—are found in the same habitats. A scientist studying squirrels in a large forest wonders if there is a difference in the sizes of the two color variants. He collects random samples of 40 squirrels of each color from a large forest and weighs them. The 40 black squirrels have a mean weight of 20.3 ounces and a standard deviation of 2.1 ounces. The 40 gray squirrels have a mean weight of 19.2 ounces and a standard deviation of 1.9 ounces. Do these data provide convincing evidence at the  significance level of a difference in the mean weights of all gray and black Eastern Gray Squirrels in this forest?

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305 0.200 = 20.0% = 0.01 1526