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TERMS

QuestionAnswer
independent variable factor being changed by the experiment (must be operationalised)
dependent variable that which changes as a result of changing the IV (operationalise)
hypothesis if....then... when...changes, then... (operationalise!!)
aim the scientific purpose of the experiment (links the IV and DV to show the purpose)
research question basically the aim in question form
how to minimise potential risks wears safety glasses, aprons, hair tied back
control group a seperate group in the experiment that isn't under the same conditions as the other measurments (usually no IV applied)
what does a control group do ? checks for the validity of the experiment, if there are no changes, then there isn't a second IV that is impacting the DV (experiment fulfils the aim)
control variables variables that are kept constant throughout the experiment, allowing the IV to be the only factor changing the DV
qualitative data data that is descriptive and non-numerical (bar graph)
quantitative data data that can be counted and measured using numbers (line graph)
graphs L IV - x axis DV - y axis
outliers readings that lie a long way from other results, often caused by random errors, or changes in controled varibales
how can the impact of outliers be reduced ? averaging results, removing the value
precision how close two or more measurment values agree with eachother between repeated trials (caused by random errors)
random erros unpredictable fluctuations in measurements (measuremnet instruments)
systematic errors consistent, directional errors that skew data towards one direction (methodology)
repeatability closeness of results between trials / under identical conditions
reproduceability closeness of results under different measurement conditions
validity when the experiment measures what it claims to be measuring
how do uncontrolled variables impact validity ? uncontrolled variables limit the methodology by introducing an unwanted second IV, meaning the data may not reflect the true effect of the IV on the DV
Created by: lipikaa
 

 



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