UNCERTAINITY/ERROR PHYSICS 9702 paper 5 help???

[mohammad4277]

confused
how do we calculate errors or error bars
ive been using thAT formula of error over uncertainity but everytime gets wrong answer
how do we calculate errors specially log related
help needed
9702 52 november 2009
9702 51 NOV 2009
in particular

 

[Manobilly]

For log values ,o/n 2009 51 the resistance would be log990 and the uncertainty would be log1000 - log980 ,this gives you the uncertainty in the value.For drawing it ,you draw the point then for error bars like for log990 you add the uncertainty found in the table to log990 you draw a small line and than u subtract log990 from the uncertainty found in table .Like for 990 I would be 8.77*10-3.Then to plot you add this value to log990.

Btw which book do you study from?