A cereal manufacturer is concerned that the boxes of cereal not be underfilled or overfilled. Each box of cereal is supposed to contain 13 ounces of cereal. A random sample of 31 boxes is tested. The average weight is 12.58 ounces and the standard deviation is .25 ounces. What is the critical value for testing the hypotheses that the mean cereal weight is different from 13 ounces at α = .001.
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