ana.chem.lec - how to do the grubbs or g test? g=...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
11:34 q test – rejection of obs.  the dilemma – one value looks way off the rest. what do we do? can we just not  use it? we must support removing the point – q test based on the range  q= gap/range calculate the range of the results find the difference between the off value and the nearest neighbor divide by the range compare to table of q’s if q is greater than the table’s values, then the gapped value can be discarded  with at least 90% confidence can only perform the q test more than once the grubbs test an alternative (more statistically solid): grubbs test takes into consideration the fact that more than one value can be  “questionable” and uses the average to compare its value grubbs test weighs on the std dev to assure the precision of the measurement
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: how to do the grubbs or g test? g= |questionable value mean| / s 1. calc. the mean value 2. find the difference between the off value and the mean divide by the std. dev compare to table of q values if g is greater than the table value then the value is further off and able to be discarded calibration curve least squares finding the best straight line (linear least squares) straight line given by y=mx +b, least squares is commonly used to generate a calibration curve it is based on minimizing the vertical (y) deviation derivation I calculus based. will avoid deviation chapter 5 quality assurance 11:34 standard additions is in the last chapter check lec slides chapter 6 11:34...
View Full Document

This note was uploaded on 06/05/2010 for the course CHEM. chm3120 taught by Professor Diaz during the Spring '10 term at University of Central Florida.

Page1 / 4

ana.chem.lec - how to do the grubbs or g test? g=...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online