10 Questions
What is precision in the context of measurements?
The closeness of measured results to each other
Which term best describes errors that occur predictably once a pattern is established?
Systematic error
What does the coefficient of variation represent?
SD divided by mean expressed as a percentage
Which type of error occurs due to poor precision and is unpredictable?
Random error
In statistical terms, what does standard deviation measure?
Dispersion of values around the mean
Which term refers to the measure of dispersion of a group of values around the mean?
Standard deviation
What type of error occurs predictably once a pattern is established?
Systematic error
Which parameter is calculated as the standard deviation divided by the mean expressed as a percentage?
Coefficient of variation
What characterizes an error that occurs unpredictably due to poor precision?
Systematic error
In the context of measurements, what does precision refer to?
Reproducibility and repeatability of measured results
Study Notes
Sources of Error
- Systematic error: occurs predictably once a pattern of recognition is established; predictable errors of the same sign and magnitude.
- Random error: occurs unpredictably due to poor precision.
Measurement Precision
- Precision refers to repeatability; reproducibility, which is how closely measured results compare with each other.
- Coefficient of variation is the standard deviation (SD) divided by the mean, expressed as a percentage.
Statistics
- Standard deviation (SD) is the measure of dispersion of a group of values around the mean.
Test your knowledge on the different types of errors in measurements, including precision, systematic error, and random error. Understand how each type of error impacts the accuracy of measured results.
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