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Hypothesis
Proposed explanation for an observation.
Double-blind testing
An experiment where neither the subject nor the researcher knows which treatment is being given.
Theory
A hypothesis that has been supported by many different experiments.
Experiment
Test of hypothesis.
Data
Information gathered from experiments.
Explain the necessity of random selection
Reduces bias / fair test
Give three features of good experimental design
A control / safe / large sample size / repeatable
Where are the results of scientific research published?
A scientific journal (e.g. Nature)
Why is it important that scientists publish the results of their research?
For peer review / so others can repeat it / information is widely available
Control
A standard to compare results from an experiment against.
Why would an investigation be repeated?
To ensure reliability.
How does a hypothesis differ from a theory?
Hypothesis can develop into a theory.
Give three limitations of the scientific method.
The extent of our knowledge / the basis of investigation / difficulty in interpreting results / changes in the natural world / accidental discoveries.
Outline the steps of the scientific method that follow the design of an experiment
Carry out the procedure / gather results / repeat / analyse data / make conclusions / publish in a scientific journal / peer review / develop a theory / develop a law or principle.
