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OCR A-Level Biology Paper 3
OCR A-Level Biology Paper 3
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OCR A-Level Biology Paper 3Precision - correct answer-The closeness of agreement between independent
measurements obtained under the same conditions
random error - correct answer-How is precision reduced?
Repeat - correct answer-How to reduce the effect of a random error?
Repeatable - correct answer-The precision ontained when measurement results are
produced over a short timescale by one person (or the same group) using the same
equipment in the same place?
Repeating - correct answer-How do you demonstrate that an investigation is repeatable?
Reproducible - correct answer-The precision obtained when measurement results are
produced over a wider timescale by different people using equivalent equipment in different
(but equivalent) places?
Valid - correct answer-Measures what it is supposed to measure
Valid - correct answer-Suitability of the investigative procedure to answer the question being
asked.
accurate - correct answer-The measure of closeness of agreement between an individual
test and the true value
error - correct answer-The difference between an individual measurement and the true value
of a quantity being measured
confidence - correct answer-A qualitative judgement expressing the extent to which a
conclusion is justified and the quality of the evidence
Independent variable - correct answer-variable that is manipulated/changed
dependent variable - correct answer-The variable that is measured - i.e. the outcome
Negative controls - correct answer-Used to check that only the independent variable is
affecting the dependent variable
comparison - correct answer-What does a control act as?
Qualitative - correct answer-Non-numerical data?
discrete - correct answer-Numerical data that can only take certain values within a range?
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