Comparing Quantities With Uncertainty Notes

In these cases t he fort example if we e isnot at t

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Unformatted text preview: may not al ways cal cul ate uncer t ai nti es for t he quant i ti es we measur e. In these cases, t he •Fort example, if we e isnot at t wo val ues di sagr ee bforsomabove ount. T hi s di sagr eement b es we can st at did t h have uncertainties calculated y the e am two density is usual l y pr esented as a pcould say that theyal ue of by e quant i t y. For exampl e, if we di d not have er cent of the v disagree th values, we uncer t ai nti es cal cul at ed for t he ab ove t wo densi t y val ues, we coul d say that they di sagr ee by 9.8 − 10.0 × 100 = 2% 10.0 (5) T he gener al rul es for compar i ng resul t s in lab rep or t s ar e these: • If uncer t ai nt i es exi st , st at e t he quant i ti es wi t h thei r uncer t ai nt y, and see if they over l ap. If t hey do, they agr ee. If not , they don’ t , and you shoul d t r y t o expl ai n why, that is, di scuss •The general rules for comparing results in lab reports are these: •If uncertainties exist, state the quantities with their uncertainty, and see if they overlap •If uncertainties do not exist, calculate a percent disagreement •If the percent disagreement is less than a few percent, the results are probably in agreement •If the disagreement is more than ten percent, they are probably not in agreement...
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