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3 cards from this section. Quick, good the night before a test.
Define random errors.
Think about what can cause different results in repeated measurements.
What is the difference between accuracy and precision?
Consider an archery analogy.
What type of error is characterized by unpredictable variations in measurements?
This error type prevents exact replication of results.
True or False: Random errors can be completely eliminated.
Consider the sources of unpredictability.
You measure the same liquid five times with results: 25.1 mL, 25.3 mL, 25.2 mL, 25.0 mL, and 25.4 mL. Calculate the average and discuss the random error present.
Use the formula for the mean to find out the average value.
If the standard deviation of your repeated measurements is 0.2 mL for a liquid, explain what this tells you about the random error.
Consider what standard deviation says about the spread of your data.
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