Recent content by nerdy_hottie

Homework Statement I need to know the concentration in ppm of a standard Fe2+ solution. (diluted) Here is the data I have. I have 0.1964 g of Fe solution the purity is 99.7% The original solution was the above # of g in 250ml water. 10ml of this was then pipetted into a 100ml volumetric flask...

I pass it in tomorrow, and I won't get it back until at least a week after that, but if I remember by then, then sure I will !

Alright thanks for all the help, I know what I'm going to do now, whether it's right or not, I don't care much at this point. Most of our mark is based on how accurate our results are, so if this is wrong or not it shouldn't affect my mark a whole lot.

No, you're understanding correctly. But now I see the place of my confusion in the first place. I thought that sx would be only one value for the whole data set. Now I see that (for this data set), there will be three separate values of sx. However, going back to the first sample example...

Oh my gosh I'm sorry I don't know what I'm talking about. Yes, I have other values for 'substance x', as you called it (samples of brass) which I have other absorbance values for. I mixed up three different samples (dilutions) of brass using three different masses of the same brass solid, and...

I have measured the absorbance.. the values are above. "Abs 0.000 0.268 0.509 0.723 " for the corresponding values of concentration. I have calculated average, "Mean y=0.500", and other such parameters, as seen above. I am performing a least squares analysis, and am as far as...

Okay sorry for any confusion but I didn't want to take the time to post all the data. I was just trying to find out the meaning of that measured y value, and apply it to the data I have now and all other data sets in the future. Right now the data set I'm working with is as follows...

Yes, but is it constant across all data sets with number of measurements, k=1 ? I mean, if I don't have to calculate it from the data given, and it's a given value for k=1, then isn't it a constant?

I have the formulas for finding sx (uncertainty in x), and all other corresponding formulas for all the values I have listed. I have another set of data which I want to find the value for 'measured y', but I don't know what it is to proceed. So is what you're saying that if I have another set of...

So how would I find the given value for another set of values? Is there a table or something based on the number of k?

Homework Statement 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...

Homework Statement Consider a flat roofed rectangular house that is 10.0 feet high with 39.0 feet long sidewalls and 20.0 feet long front and back walls. We are given that: Wall: (R Value =0.20 plaster)+(R Value=10.00 insulation)+(R Value=0.60 plywood)+(R Value=0.50 cedar shingles)...

ok thanks for the clarification but that still doesn't produce the correct answer. Thanks for your help though.

I'm not quite sure I understand that last equation..

Homework Statement "You are measuring the density of a metal sample. You have determined that the mass of the sample is 63.8 grams, and your error in this result is plus or minus 0.1 g. The volume of the sample is 8.8 +/- 0.1 cm^3. What is the maximum error (in g/cm^3) in your measurement of...