GENERAL KNOWLEDGE

GK

PHYSICS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
April forgot to calibrate her analytical balance before she measured the mass of her reactants in a chemistry experiment. She committed 78% percentage error in her measurement. What type of measurement error did she commit?
A
human error
B
parallax error
C
random error
D
systematic error
Explanation: 

Detailed explanation-1: -Random error mainly affects precision, which is how reproducible the same measurement is under equivalent circumstances. In contrast, systematic error affects the accuracy of a measurement, or how close the observed value is to the true value. Taking measurements is similar to hitting a central target on a dartboard.

Detailed explanation-2: -s = Ö[SNi=1(ti-átñ)2 / (N-1) ]. About two-thirds of all the measurements have a deviation less than one s from the mean and 95% of all measurements are within two s of the mean.

Detailed explanation-3: -All measurements have a degree of uncertainty regardless of precision and accuracy. This is caused by two factors, the limitation of the measuring instrument (systematic error) and the skill of the experimenter making the measurements (random error).

Detailed explanation-4: -The error may arise from the different source and are usually classified into the following types. Gross Errors. Systematic Errors. Random Errors. Gross Errors. More items

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