1. The problem statement, all variables and given/known data So I'm doing a Least Squares Analysis and I'm wondering about what the 'measured mean value of y for replicate measurements of the unknown' value is supposed to be. I have no idea in the world what it's asking for. The value it is speaking of is not the same as the average value in y. I will post the example so you can see what I'm talking about. Least-Squares Spreadsheet X Y 1 2 3 3 4 4 6 5 m 0.615384615 1.346153846 b sm 0.054392829 0.214144783 sb R2 0.984615385 0.196116135 sy n= 4 Mean y= 3.5 Σ(xi-mean x)2 13 *********Measured y= 2.72 k= number of replicate measurements of y= 1 Derived x= 2.2325 sx= 0.373502805 2. Relevant equations I'm looking for an equation, or an explanation as to how to obtain the value. 3. The attempt at a solution I have asterisks (********) next to the measured y value in the spreadsheet. (The value is 2.72). The only reason I know what it is in this case is because this is an example from my text book. I have no idea where it comes from, but I need it for an equation to be able to do my lab and I don't know how to find the value. As far as I can make sense of it, I have no means of calculating 'measured mean value of y for replicate measurements of the unknown', as there are no replicate measurements of the y values. Right? Just in case it helps, this is for an analytical chemistry lab, but it's pertaining to statistics, so I asked it here. Thanks.