My Math Forum How to combine two uncertainities into a single value

 March 18th, 2009, 06:29 PM #1 Newbie   Joined: Mar 2009 Posts: 1 Thanks: 0 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 Thanks

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