A chemical engineer claims that the population mean yield of a certain batch process is 500 grams per milliliter of raw material. To check this claim he samples 25 batches each month. If the computed t-value falls between -t0.05 and t0.05, he is satisfied with this claim. What conclusion should he draw from a sample that has a mean = 518 grams per milliliter and a sample standard deviation s = 40 grams? Assume the distribution of yields to be approximately normal.

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