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researcher would like to test the effectiveness of a newly developed growth hormone. The researcher knows that under normal circumstances laboratory rats reach an average weight of u= 950 grams at 10 weeks of age, The distribution of weights is normal with a standard deviation of 30. A random sample of n=25 newborn rats is obtained, and the hormone is given to each rat. When the rats In the sample reach 10 weeks old, each rat is weighed. The mean weight for this sample is M=974.

a. Sketch the appropriate distribution, and locate the critical region for the alpha level =.05.

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