How Do You Calculate Percent Disagreement?

  • Thread starter Thread starter rachelle
  • Start date Start date
  • Tags Tags
    Percent
Click For Summary
To calculate percent disagreement, the correct formula involves finding the relative error between the expected value and the measured value. In this case, the calculation should be based on the difference between the expected value (0.541) and the measured value (0.715), divided by the expected value, then multiplied by 100 to convert it to a percentage. The correct percent disagreement is approximately 32.2%. The discussion clarifies the importance of using the correct formula for relative error. The participant successfully resolves their confusion and confirms their understanding of the calculation.
rachelle
Messages
18
Reaction score
0
Ok, I'm doing my Physics lab and I was told to give a "percent disagreement" if any.. I know it's a very simple question, but I want to make sure if I understood it right...

So say I get an expected value to be .541 and when I calculated it, the answer is .715... so is the "percent disagreement" to be 32%? (.541 + .715/.541)

Can someone verify if this is correct... thanks in advance :smile:
 
Physics news on Phys.org
Eeh?
Whatever have you written here??
You are to compute the relative error!
(finding the percent from that is easy, just shift the decinal point two places in the correct direction)
 
Whoops, I got the correct answer but I meant .541 - .715/.541
and my true value was actually .541
Anyway, I got it, thanks
 

Thread 'Magnitude of buoyant force in fluids of different densities'

The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?
View full post »

Similar threads

Uncertainty Error and Significant Figures in this Force Tables Lab
  • · Replies 4 ·
Replies
4
Views
3K
How do I calculate percent elasticity?
  • · Replies 5 ·
Replies
5
Views
7K
Percent Uncertainty Shenanigans
  • · Replies 4 ·
Replies
4
Views
2K
Spectrophotometric Determination of Fe2+ (Beer's Law)
  • · Replies 1 ·
Replies
1
Views
2K
Calculating percent error in a lab
  • · Replies 1 ·
Replies
1
Views
5K
Sig figs/certainty in percent error calculation
  • · Replies 8 ·
Replies
8
Views
5K
Change In Gravitational Energy Percent Error
  • · Replies 10 ·
Replies
10
Views
4K
How Do You Calculate Uncertainty in Acceleration from Photogate Timer Data?
  • · Replies 3 ·
Replies
3
Views
10K
High School How do you multiply percents on paper
  • · Replies 4 ·
Replies
4
Views
1K
Calculate Percent Error: Measuring 75cm with Meter Stick
  • · Replies 5 ·
Replies
5
Views
5K