Practical Science Key Terms Flashcards
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Measurement valid
It measures what it is supposed to be measuring
Result accurate
When it is close to true value
Precise results
When repeat measurements are consistent closely with each other
Repeatability
How precise repeated measurements are when they are taken by same person using same equipment under same condition
Reproducibility
How precise repeated measurements are when taken by different people using different equipment
Uncertainty of measurements
Interval within which the true value is expected to lie
Measurement error
Difference between measured value and true value
What type of error is cause by results varying around true value
Random error
Systematic error
Consistent difference between measured values and true values
Zero error
Measuring instrument giving false reading when true value is 0
Which variable is changed or selected by investigators
Independent
Dependant variable
Variable that is measured everytime
Fair test
Which only the independant variable affects depending variable
Control variables
Variables that should be controlled to avoid effecting dependant variable
