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A quality control (QC) manager for a manufacturing firm is calculating the expected standard deviation (s) for the length of hex bolts being produced on the assembly line. There are two sources of variation in the length of the hex bolts: production variation and measurement error. The QC manager knows that the standard deviations from these two sources are 0.24 inch and 0.43 inch, respectively. Assuming that there are no other significant sources of error, what answer should the QC manager calculate for the total standard deviation of the length of the hex bolts?
Correct Answer: D
When you add SD, first take Variance, add up and then take Sq root. Thus New SD = Sqrt(0.24*0.24 + 0.43*0.43) = Sqrt(0.2425) = 0.49