The short answer can be found in item 2 in this link:
http://science.widener.edu/svb/stats/error.html
The long answer is "I highly recommend Error Analysis by John Taylor:"
http://science.widener.edu/svb/stats/error.html
If you can find the first edition (which can fit in your pocket) then
PhD studentship in biochemistry/structural biology, University of Nottingham
We are looking for a highly motivated individual with a background in
biochemistry or related discipline to join a project on the discovery and
characterisation of deubiquitinating enzyme ligands. The aim of the project
===
SYNCHROTRON BEAM TIME FOR MACROMOLECULAR CRYSTALLOGRAPHY AT SLS
===
Proposal application deadline: Wednesday, June 15, 2011
Periods:
September 1, 2011 - De