Reply
Wed 30 Oct, 2013 03:12 pm
2. The following analytical data were obtained for a spectrophotometric analysis:
Conc.(mg dm3): Absorbance
10 0.105, 0.090
20 0.201, 0.188
50 0.495, 0.513
100 0.983, 1.120
200 1.964, 2.013
(i) compute r and r2, and explain what their values indicate,
(ii) find the regression equation of absorbance on concentration,
(iii) predict the concentration , if the absorbance was 0.730.
(iv) plot the residuals from the regression analysis against the concentration. What does the resulting pattern indicate?
@emido22,
Do you have a calculator with statistical functions? Most engineering/math calculators will calculate r, r2, a and b for you. It should also give you the residuals. Otherwise, you can do it in Excel or a stat package. Paper and pencil work too for n=5
@emido22,
Where is the answer of this statistic please
Stumble It!
Tweet This
Bookmark on Delicious
Share on Facebook
Share on MySpace