{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

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

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

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

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

View Full Document

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

View Full Document
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

• Spring '10
• DIAZ
• calibration curve, best straight line, grubbs test, nearest neighbor divide, range  q= gap/range, g= |questionable value

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern