Practical Key Terms Flashcards
When is a measurement valid
When it measures what it’s supposed to be measuring
When is a result accurate
When it is close to the true value
What are precise results
When repeat measurements are consistent/ agree closely to eachother
What is repeatability
How precise repeated measurements are when taken by same person under same conditions w same equipment
What is reproducibility
How precise repeated measurements are when they are taken by different people using different equipment
What is the uncertainty of a measurement
The interval within which the true value is expected to lie
Define a measurement error
The difference between a measured and true value
What is a random and systematic error
Random error has results varying around the true value in an unpredictable way
Systematic error has a consistent difference between the measured values and true values
Zero error definition
A measuring instrument gives a false reading when it’s supposed to be zero
Define a fair test
A test in which only the independent variable is allowed to affect the dependent variable
