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A manufacturer of chocolate chips would like to know whether its bag filling machine works correctly at the 437 gram setting. It is believed that

A manufacturer of chocolate chips would like to know whether its bag filling machine works correctly at the 437 gram setting. It is believed that the machine is under filling the bags. A 31 bag sample had a mean of 430 grams. Assume the population standard deviation is known to be 26. Is there sufficient evidence at the 0.05 level that the bags are underfilled

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