Chemistry (Check)
posted by Bryan .
Label each of the three following sentences that describe accuracy with an A. Label each sentence that describes precision with a P.
___P___5. Four of five repetitions of a measurement were named numerically identical, and the fifth varied from the others in value by less than 1%.
___A____6. Eight measurements were spread over a wide range.
___A____7. A single measurement is within 1% of the correct value.
I GUESS I would call the first one P but it depends, partly at least, on whether 1% is acceptable or not. Frankly, I don't think 1% is very good precision. (1% is 10 parts per thousand. I think of good as 1 part per thousand.) I am also troubled by the phrase "were named numerically equal". I don't know what that means.
For #6 I GUESS I would might call it accuracy although it really isn't because there is nothing to indicate how close these measurments were to the accepted value. Eight measurements spread over a wide range with nothing to indicate how far the average of these numbers are from the accepted value makes me think this is an example of VERY POOR precision.
7. I would choose accuracy.
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