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An ornithologist working at a south coast reed swamp wishes to know if the habitat is used by migrating reed warblers for "fattening up" before taking off on migration. Birds arrive in numbers during August and stay at least until the end of September. A sample of reed warblers was weighed in August, and the same set of birds was weighed in September. Following are the weights of the reed warblers (in grams) in the sample. Reed Warbler 1 2 3 4 5 6 7 8 9 10 August 10.3 11.4 10.9 12.0 10.0 11.9 12.2 12.3 11.7 12.0 September 12.2 12.1 13.1 11.9 12.0 12.9 11.4 12.1 13.5 12.3 Is there evidence here to suggest that the mean weight of the reed warblers tends to be heavier in September than in August? Use a 0.05 level of significance. Assume that the weights are normally distributed