1.2 Flashcards
(10 cards)
What is random error
Random errors cause unpredictable fluctuations in an instrument’s readings as a result of uncontrollable factors, such as environmental conditions
How to reduce random error
Repeat measurements several times and calculate an average from them
What is systematic error
Systematic errors arise from the use of faulty instruments used or from flaws in the experimental method
This type of error is repeated consistently every time the instrument is used or the method is followed, which affects the accuracy of all readings obtained
How to reduce systematic error?
Instruments should be recalibrated, or different instruments should be used
Corrections or adjustments should be made to the technique
What is 0 error?
This is a type of systematic error which occurs when an instrument gives a reading when the true reading is zero
This introduces a fixed error into readings which must be accounted for when the results are recorded
What is prescision?
Precise measurements are ones in which there is very little spread about the mean value, in other words, how close the measured values are to each other
What is accuracy?
A measurement is considered accurate if it is close to the true value
What is repeatability?
A measurement is repeatable if the original experimenter repeats the investigation using the same method and equipment and obtains the same results
What is reproductibilty?
A measurement is reproducible if the investigation is repeated by another person, or by using different equipment or techniques, and the same results are obtained
What is resolution?
Resolution is the smallest change in the quantity being measured of a measuring instrument that gives a perceptible change in the reading
