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March 18th, 2009, 06:29 PM   #1
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How to combine two uncertainities into a single value

Can some please tell me, in a step by step method, or, even better, calculate for me how to combine two uncertainities into a single value?

I think it's done by the method of least squares but it's been 15years since I took stats and I have no recollection on how to do that:

Here are the values:

One measuring instrument has an uncertainity of: 1 Kpa
Another measuring instrument has an uncertainity of: 25.74 kPa

What is the combined value of uncertainity of the two

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