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A steel manufacturing company in Australia uses two independent technologies for manufacturing a certain steel item. It has been observed that the average weight in

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A steel manufacturing company in Australia uses two independent technologies for manufacturing a certain steel item. It has been observed that the average weight in a sample of 300 items produced from one technology is found to be 170 kilos with a standard deviation of 18 kilos. While the corresponding figures in a sample of 480 items form the other technology are 168 and 17. Is the difference between the two sample means are significant at 5% level of significance

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