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AQA GCSE Science - Science Key Words
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Terms in this set (28)
Accuracy / Accurate
A measurement is that is close to the true value.
Anomaly
Results that do not follow the general pattern. They are not part of the variation caused by random uncertainty.
Bias
When one answer is favoured over another, leads to unreliable results.
Categoric Variables
Variables with values that have labels or names, not numbers.
Continuous Variables
Variables with values that can be counted or measured.
Control Variables
Variables that should be kept the same (or monitored) in an investigation.
Dependent Variable
The outcome you measure in an investigation.
Directly Proportional
When the dependent variable increases by the same amount that the independent variable increases by. They show a straight line graph.
Fair Test
An investigation that only has one independent variable that will affect the dependent variable.
Hypothesis
A research statement. (Changing ____ will affect ___. / How does ____ affect ___?)
Independent Variable
The variable you change in the values of in an investigation.
Interval
The difference between individual readings.
Measurement Error
The difference between a measured value and the true value.
Precision
Measurements that are very close to the mean value. Depends only on the extent of random errors.
Prediction
A statement that suggests what will happen in an investigation.
Qualitative Data
Results based on observations made.
Quantitative Data
Results based on measurements taken, results are numbers.
Random Error
Differences in results that can be reduced by taking more measurements and calculating a mean.
Range
The minimum and maximum values of the independent variable. (From ___ to ___)
Repeatable
Results that are the same when you do the experiment again, using the same method and equipment.
Reproducible
Results that are the same when another group does a similar experiment using different equipment.
Resolution
The smallest interval of a measurment tool.
Systematic Error
Differences in results that are caused by the instrument you use, the environment, or the method of observation. Can only be reduced by using a different method or equipment.
True value
The value that you would expect if the results were collected in an ideal measurement.
Uncertainty
The interval of data that you would expect to find the true value in.
Validity
How suitable a method is to answer the reseach question. An investigation that has suitable controlled variables.
Variables
Quantities or characteristics that can be changed in an investigation.
Zero Error
A measurement tool that does not read zero when expected. Examples include the needle of an ammeter not returning to zero when not current will flow. They are examples of systematic error.
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