In a numerical analysis sense, it means you've made a mistake/forgotten to take the modulus, as the formula for error calculation involves taking modulus values:
Erel= |x-x*| / |x|, where x is the proper value, and x* an approximate value.
Percentage error is just the relative error (formula above) x100, so really if you calculate it correctly, its actually impossible to get a negative percentage error.
That aside, the only thing a negative error means, besides making a mistake, is that your approximation is larger/smaller than the real value, depending on which one you take away from, as it doesn't matter if you do x-x* or x*-x due to the modulus. The only thing that matters about any error value, is the size/number, which indicates by how much your approximation differs from the real value.
A percentage error is 100*(measurement - true value)/true valueThe percentage error is negative if the measured (or calculated) value is smaller that the true value.
Of course. Your answer can be a smidgen too big or a smidgen too small.
it will be negative if the accepted value is less than the experimental value **********************2nd Opinion************ Don't you have that turned around?
Look on the equipment for where it says the plus or minus figure for accuracy (for a burette it is usually + and _ 0.1cm3) divide this by the amount you measured , times 100 to make it a percentage. ---- ---- Percentage Error = Maximum Error / Measured Value X 100 For example.Maximum Error for the following apparatus are:Balance = +/- 0.01Pippette = +/- 0.1 And the Measured value for each are:Balance = 0.15Pippette = 25 Then...the percentage error is:Balance percentage error = 0.01 / 0.15 X 100 = 66.66%Pippette percentage error = 0.1 / 25 X 100 = 0.3% You can now also work out your maximum total error.Maximum total Percentage error = Balance Percentage error + Pippette Percentage errorMaximum total percentage error = 66.66 + 0.4 = 67.06%
yes, it is. The smaller the measurement, the higher the percentage error.
A percentage error is 100*(measurement - true value)/true valueThe percentage error is negative if the measured (or calculated) value is smaller that the true value.
Of course. Your answer can be a smidgen too big or a smidgen too small.
Yes
percentage error= experimental value-accepted value/ accepted value x 100 (percentage error is negative only if the accepted value is larger than the experimental value) percentage error= 9.67-9.82/9.82 x 100 percentage error= -1.6
it will be negative if the accepted value is less than the experimental value **********************2nd Opinion************ Don't you have that turned around?
Go find out.Or:(calculated value) - (actual value)---------------------------------------- * 100(%) = percentage of error(actual value)(if the top value is negative, just switch the two or multiply by -1)
error in calculation or your final product is impure and has residuals of chemicals that were supposed to dissappear
easy
Percentage Error is: ~1.4% (1.39049826188%)
Look on the equipment for where it says the plus or minus figure for accuracy (for a burette it is usually + and _ 0.1cm3) divide this by the amount you measured , times 100 to make it a percentage. ---- ---- Percentage Error = Maximum Error / Measured Value X 100 For example.Maximum Error for the following apparatus are:Balance = +/- 0.01Pippette = +/- 0.1 And the Measured value for each are:Balance = 0.15Pippette = 25 Then...the percentage error is:Balance percentage error = 0.01 / 0.15 X 100 = 66.66%Pippette percentage error = 0.1 / 25 X 100 = 0.3% You can now also work out your maximum total error.Maximum total Percentage error = Balance Percentage error + Pippette Percentage errorMaximum total percentage error = 66.66 + 0.4 = 67.06%
POST will indicate error messages by a series of beeps or a series of lighted-up LEDs (depending on your computer).
Percentage error measures the error in relation to the quantity measured. For example if something weighs 100 grams with a possible error of plus or minus 5 grams, this is an error of 5%