Accuracy - A measurement result is considered accurate if it is judged to be close to the true value., Calibration - Marking a scale on a measuring instrument, Data - Information, either qualitative or quantitative, that has been collected., Measurement error - The difference between a measured value and the true value., Anomalies - These are values in a set of results which are judged not to be part of the variation caused by random uncertainty., Random error - These cause readings to be spread about the true value, due to results varying in an predictable way from one measurement to the next.dictable way from one measurement to the next.dictable way from one measurement to the next., Systematic error - These cause readings to differ from the true value by a consistent amount each time a measurement is made. , Zero error - Any indication that a measuring system gives a false reading when the true value of a measured quantity is zero., Evidence - Data which has been shown to be valid, Fair test - A fair test is one in which only the independent variable has been allowed to affect the dependent variable., Hypothesis - A proposal intended to explain certain facts or observations, Interval - The quantity between readings, eg a set of 11 readings equally spaced over a distance of 1 metre would give an interval of 10 centimetres., Precision - Precise measurements are ones in which there is very little spread about the mean value, Prediction - A prediction is a statement suggesting what will happen in the future, based on observation experience or a hypothesis.,, Range - The maximum and minimum values of the independent or dependent variables; important in ensuring that any pattern is detected, Repeatable - A measurement is repeatable if the original experimenter repeats the investigation using same method and equipment and obtains the same results., Reproducible - 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, Resolution - This is the smallest change in the quantity being measured (input) of a measuring instrument that gives a perceptible change in the reading., Uncertainty - The interval within which the true value can be expected to lie, with a given level of confidence or probability, eg “the temperature is 20°C ± 2°C, at a level of confidence of 95%., Valid conclusion - A conclusion supported by valid data, obtained from an appropriate experimental design and based on sound reasoning., Categoric variables - Categoric variables have values that are labels, eg names of plants or types of material, Continuous variables - Continuous variables can have values (called a quantity) that can be given a magnitude either by counting or my measuring., Control variables - A 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, Dependent variables - The variable in which we measure, Independent variables - The variable in which is changed in the investigation,

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