Retrieval QUestions Flashcards
When is a measurement valid?
When it measures what it is supposed to be measuring
what is repeatability
how precise repeated measurements when they are taken by the same person,using the same equipment, under the same conditions
when is the result accurate
when it is closer to the true value
what are precise results
when repeat measurements are consistent/agree closely with each other
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 measurement error
difference between a measured value and the true value
What type of error is caused by results varying around the true value in an unpredictable way?
random error
what is a systematic error?
a consistent difference between the measured values and true value
what does zero error mean
a measuring instrument gives a false reading when the true value should be zero
what is dependant variable
a variable that is measured every time the independent variable is changed
