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Question

# How do we know whether a measurement is precise or accurate? ​​​​​​What is a vernier constant?

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Solution

## To determine if a value is accurate compare it to the accepted value. As these values can be anything a concept called percent error has been developed. Find the difference (subtract) between the accepted value and the experimental value, then divide by the accepted value. % error = (accepted - experimental) / accepted *100% To determine if a value is precise find the average of your data, then subtract each measurement from it. This gives you a table of deviations. Then average the deviations. This will give you a value called uncertainty. A plus or minus value that says how precise a measurement is. deviation = (average - actual) standard deviation = (deviations for all measurements added together) / number of measurements Vernier Constant It is the ratio of smallest division of main scale to the number of divisions of vernier scale.

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