I have to find the percentage of error. The accepted value is 11.35, while the value I got is 2.564. I got 2.564-11.35/11.35, and got a negative answer. Can percentages of error be negative? Thanks-Coralie.

  1. 👍 0
  2. 👎 0
  3. 👁 91
  1. The reason that your value is negative is that, it depends on which number you put first, when subtracting the accepted value from the experimental actual value, you have to put a | | (absolute sign) around the subtracted values. (that means that the value is accepted as being possitive,even if the value comes out negative because the actual experimental value was smaller than the accepted value.

    so it comes out as..
    | 2.564- 11.35|/11.35 x 100 = 77.41% error

    It can't be negative.

    1. 👍 0
    2. 👎 0
  2. Some profs like to use the absolute value so they always subtract the larger number minus the smaller number (so as to get a positive value) and divide by the accepted value and that times 100. The same rational applies to using the | | to obtain the absolute value as Christina has answered. But to answer your question, yes, there can be a negative value. And some profs like to use the negative value so they ALWAYS subtract it this way.
    [(exp value - accepted value)/accepted value]*100 which ALWAYS gives a negative value if the experimental value is lower than the accepted value and ALWAYS gives a positive value if the experimental value is higher than the accepted value. The rationale of those profs is that the sign (negative or positive) tells them immediately if the result was too high or too low. I never worried about that piece of information because if it was in error more than about 0.2% to 0.4%, that was too much for me and I started over. I hope I didn't provide far more information than you wanted.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Percent error?

    What is the formula for percent-error? It's either: %error= (your value/accepted value)*100 or %error= (accepted value/your value)*100 I'm pretty sure it's the first one, but I also heard it can go either way. I tried both ways

    asked by Emily on January 13, 2008
  2. physics

    Percentage error in displacement time and mass are 2%, 1% and 3%. Find percentage error in the measurement of force.

    asked by niharika on July 15, 2012
  3. physics

    Compare the slope of the velocity-time graph to the average of all your acceleration values. Are they close? What does the slope of a velocity (or speed) vs. time graph mean? Explain the answer using your data. How does the value

    asked by Hope Grey on December 20, 2013
  4. Chemistry

    I'm doing measurements & their uncertainty and I can't find this. Does anyone know where I can look? "Percent error is calculated by dividing the _____of the error by the accepted value and then multiplying by _______.

    asked by Sue on September 16, 2008
  5. Calculus

    Estimate delta(x) using the Linear Approximation and use a calculator to compute both the error and the percentage error. f(x)=cosx a=(pi/4) delta(x)=.06 delta(x)= ______ i got this part and it's -.04242 The error in Linear

    asked by Anonymous on October 13, 2007
  6. Math(ANSWERCHECK)!!

    percent error formula= |experimental value -accepted value| / |accepted value| * 100% % error = |0.846 g/mL - 0.78948 g/mL| / |0.78948 g/mL| *100% = 7.31 % Is 7.31% correct or was there a calculation mistake?

    asked by Jess on September 28, 2015
  7. physics please

    there are nearly (pi) x (10^7) seconds in one year. find the percentage error in this approximation, where percentage error is defined as abs value[ (assumed value - true value)/ true value] x 100% to find the true value I did:

    asked by sam on January 22, 2010
  8. Chem (Check)

    The accepted value of a length measurement is 200cm, and the experimental value is 198cm. Circle the letter of the value that shows the precent error of this measuerment. a)2% b)-2% c)1% d)-1% is it b)-2% No. What is 2/200 * 100?

    asked by Bryan on January 12, 2007
  9. chemistry

    the accepted density of helium at stp is 0.18 g/L. during an expirement, 0.10g of helium with a volume of 0.54L at stp was collected. what is the percent error in this expirement? (accepted-expiremental)/accepted X 100

    asked by dani on April 21, 2015
  10. Chemistry

    To calculate the percent error you would use the error in measurement divided by accepted value times 100 correct? So for an experiment in which you had to find the concentration of a dye in a powdered drink solution, to find the

    asked by Hannah on October 12, 2011

More Similar Questions