The developer of a new welding rod claims that spot welds using his product will have greater strength than conventional welds. For 33 welds using the new rod, the tensile strength is 23540 pounds per square inch, with a standard deviation of 600 pounds. For 37 conventional welds on the same materials, the average tensile strength is 23100 pounds per square inch, with a standard deviation of 750 pounds. Assuming normally distributed populations with equal standard deviations, use the 0.05 level of significance in testing the claim of the superiority of the new rod. Based on the calculated and critical values, is the null hypothesis rejected?

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The developer of a new welding rod claims that spot welds using his product will have greater strength than conventional welds. For 33 welds using the new rod, the tensile strength is 23540 pounds per square inch, with a standard deviation of 600 pounds. For 37 conventional welds on the same materials, the average tensile strength is 23100 pounds per square inch, with a standard deviation of 750 pounds. Assuming normally distributed populations with equal standard deviations, use the 0.05 level of significance in testing the claim of the superiority of the new rod. Based on the calculated and critical values, is the null hypothesis rejected?

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