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A manufacturer of banana chips would like to know whether its bag filling machine works correctly at the 439 439 gram setting. It is believed that the machine is underfilling or overfilling the bags. A 26 26 bag sample had a mean of 443 443 grams with a variance of 225 225 . Assume the population is normally distributed. Is there sufficient evidence at the 0.01 0.01 level that the bags are underfilled or overfilled?