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Please answer with solution/explanation. A government agency is investigating a complaint from some concerned citizens who said that there is short - weight selling of

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A government agency is investigating a complaint from some concerned citizens who said that there is short - weight selling of rice in a certain town. An agent manufacturer took a random sample of 20 sacks of " 50-kilo" sacks of rice from a large shipment and finds that the mean weight is 49.7 kilogram with standard deviation of 0.35 kilogram. Is this a sufficient evidence of short weighting at the 0.01 level of significance

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