Refer to Exercise 11. 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 10°C/s, cooling all 10 welds at the rate of 30°C/s, or cooling 5 welds at 10°C/s and 5 at 30°C/s? Explain.
What will be an ideal response?
The standard deviation of the difference between the means is 
If all 10 new welds are cooled at 10°C, then 
The standard deviation of the difference between the means is then 
If all 10 new welds are cooled at 30°C, then 
The standard deviation of the difference between the means is then 
If 5 of the new welds are cooled at 10°C and 5 at 30°C, then 
The standard deviation of the difference between the means is then 
Therefore the confidence interval would be most precise if all 10 new welds were cooled at 10°C.
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____ is used to reduce the rate at which welds cool.
A. Preheat B. Annealing C. Normalizing D. Stress relieving
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What will be an ideal response?
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