Posted by **Amiga** on Thursday, September 14, 2006 at 8:44pm.

We're actually learning propigation of error in my chem class, but it seems to be used equally as much in Physics/Stats.

My teacher showed us two methods of doing it:

REAL Method (Addition/Subtraction):

square root[(error absolute 1)^2 + (error absolute 2)^2 +...(error absolute n)^2]

"Our School's" Method:

(Error absolute 1) + (Error absolute 2) +... (error absolute n)

Real Method (Mult/Div)

square root[(error % relative 1)^2 + (error % relative 2)^2 + ... (error % relative n)^2]

"Our" Method:

(Error % rel 1) + (error % rel 2) + ... (error % rel n)

He also has written

Absolute error/magnitude x 100 = Error % relative?

After doing most of a problem out, we have this:

1.0(sub 8) +/- 1(sub 8) %

We divide that by 100 to get rid of the percent and get

1.0(sub 8) +/- .18 REL error

I'm not sure what to do next, but we end up getting

1.0(sub 8) +/- 0.1(sub 9) which gives us an answer of 1.1 +/- .2 g/mL

How do I get from relative error to absolute error? In other words, what happened between the part where I got the relative error, and the part I don't know how to do?

## Answer This Question

## Related Questions

- university physics - Derive absolute error in equations: 1)Derive absolute error...
- Chemistry - How do you find Absolute error and how do you find relative error? ...
- Calculus - Estimate delta(x) using the Linear Approximation and use a calculator...
- Propagating error - Find the absolute and percent relative error for each calc. ...
- Using Matlab - imagine you have a simple calculator that can only do addition,...
- chem/stats - Find the absolute error for the answer of the following equation: ...
- Statistics - An opinion poll asks a random sample of 100 college seniors how ...
- Algebra 2: Prob and Stats - A survey of 480 high school students found that 37% ...
- Physics 11 - In physics we did a lab experiment that involved finding the Heat ...
- grammar - Matching. Each of the following sentences has an agreement error in it...

More Related Questions