ISA Vocabulary 0.0 / 5 ? ScienceISAGCSEAQA Created by: marleseleanor1Created on: 14-10-13 17:20 Prediction This describes what you think will happen in an experiment 1 of 26 Valid The results and conclusions will be this if the variables are correctly controlled 2 of 26 Fair Test This is where only the independent variable is changed and the others controlled 3 of 26 Hypothesis A scientific statement that explains certain facts or observations 4 of 26 Interval This is the difference between the values of your independent variable 5 of 26 Data Informationor measurements that you collect 6 of 26 Datum One piece of information 7 of 26 Systematic Error This is an error that is always the same for each repeat- usually because of an arror in the equipment used 8 of 26 Resolution The smallest change that can be read from a measuring device for example a ruler measured in mm or cm 9 of 26 Repeatable If the same person can get the same reading using the same equipment and method 10 of 26 Categoric Variable A variable that can be described by a label or category such as colour or surface 11 of 26 Control Variable Variables that remain constant, to make sure that an investigation is valid 12 of 26 Independent Variable This is the variable that is changed during an investigation. There should be one of these 13 of 26 Continous Variable A variable which can have any numerical value 14 of 26 Dependent Variable This is the variable that changes as a result of a change in the independent variable 15 of 26 Uncertainty The range around a true value. For example 20cm +/-2cm 16 of 26 Measurement Error The difference between the real value and the measured value 17 of 26 Anomaly A result that does not fit the pattern 18 of 26 Random Error The error causes measurements to be spread around the true value- can be reduced be taking repeats and calculating a new mean 19 of 26 Zero Error When a piece of measuring equipment should be reading zero but it doesn't 20 of 26 Accuracy How close the reading is to the true value 21 of 26 Precision This is determined by the scale on the measuring apparatus e.g. a ruler marked mm is more precise than one cm 22 of 26 Calibration When we make sure that measuring apparatus is making correct readings e.g. the temperature of melting ice is 0 degrees celsius 23 of 26 True Value This is the real value of a measurement in an experiment 24 of 26 Reproducible If another person can get the same result using the same method and equipment or with different methods or equipment 25 of 26 Range The maximum and minimum values of the independent or dependent variables e.g. 'from 10cm to 50cm' 26 of 26
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