Flashcards in How science works Deck (18)
How close it is to the true value
When the repeated measurements are similar
A measurement is repeatable if the original experimenter repeats the investigation using same method and equipment and obtains the same results.
A measurement is reproducible if the investigation is repeated by another person, or by using different equipment or techniques, and the same results are obtained.
Values in results that are not part of variation caused by random uncertainty
These cause readings to be spread about the true value, due to results varying in an unpredictable way from one measurement to the next.
Any indication that a measuring system gives a false reading when the true value of a measured quantity is zero, e.g. the needle on an ammeter failing to return to zero when no current flows.
A control variable is one which may, in addition to the independent variable, affect the outcome of the investigation and therefore has to be kept constant or at least monitored
the variable for which values are changed or selected by the investigator
the variable of which the value is measured for each and every change in the independent variable
Measurement error that is constant or follows a pattern
The interval within which the true value can be expected to lie
The difference between a measured value and the true value
Measurement error due to unpredictable variation from one reading to the next
Where the only thing affecting your dependent variable is your independent variable
Data that can have a value anywhere on a continuum between two extremes
Data that fits into a number of distinct classes or categories