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In a study of the effect of cooling rate on the hardness of welded joints, 50 welds cooled at a

In a study of the effect of cooling rate on the hardness of welded joints, 50 welds cooled at a rate of 10oCs had an average hardness of 90.7 and a standard deviation of 4.18. Ten more welds will be made in order to increase the precision of the confidence interval. Which would increase the precision the most, cooling all 10 welds at the rate of 10oCs, or cooling 5 welds at 10oCs? Explain.

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