How Science Works Glossary 0.0 / 5 ? BiologyPractical applications of biologyASAQA Created by: chickpeatweetCreated on: 07-04-15 14:25 Accuracy Measurement is close to true value 1 of 18 Anomalous Data Measurements fall outside the expected range 2 of 18 Causal Relationship Results are caused by a change in another variable 3 of 18 Confounding Variable A variable other than the independent which affects the outcome. They must be kept constant or monitored 4 of 18 Control Experiment Uses a method which limits the possibility of a confounding variable affecting the results 5 of 18 Control Group Treated in exactly the same way as the experimental group but do not receive the actor which is being measured. Allows comparison and makes data valid 6 of 18 Correlation Relationship between two variables but is not causal 7 of 18 Dependent Variable Value is measured for each change in independent variable 8 of 18 Double-blind trial Neither scientist or participant know the treatment the individual is receiving 9 of 18 Independent Variable Values are changed 10 of 18 Placebo A dummy replica of the substance given to the experimental group given to the control. Produces valid data 11 of 18 Precision Smallest scale division on the measuring instrument 12 of 18 Probability Likelihood of an event occurring expressed mathamtically 13 of 18 Random Distribution Data is collected at random to avoid observer bias 14 of 18 Random errors Errors caused by human error, faulty technique or equipment 15 of 18 Reliability If the experiment was repeated the results would be the same. Measured by repeating measurements 16 of 18 Validity Data is affected by the independent variable only and is supported by reliable and valid data 17 of 18 Zero Errors Instruments which have an incorrect zero 18 of 18
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