. It is known in a pharmacological experiment that rats fed with a particular diet over a certain period gain an weight gain of 43 gms with variance 7 gms2 . Test the hypothesis that the new diet is an improvement assuming normality?

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producers: apple trees, potatoes, carrots, grains, acorns, cabbage, grass, corn, lettuce

consumers: deer, mice, rabbits, chickens, squirrels, horses, worms, cows

predators: eagles, frogs, wolves, owls

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