In a study of the effect of cooling rate on the hardness of welded joints, 50 welds
Question:
a. Find a 95% confidence interval for the difference in hardness between welds cooled at the different rates.
b. Someone says that the cooling rate has no effect on the hardness. Do these data contradict this claim? Explain.
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a X 911 s X 623 n X 50 Y 907 s Y 434 n Y 40 z025 196 ...View the full answer
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