How science works

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What is the independent variable?
Changed Variable
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What is the dependent variable?
Measured variable
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Why could there be a control investigation?
To show independent variable is causing effect
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What is range?
Highest and Lowest with units
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Why do we repeat experiments?
Improve reliability, Reduce chance of anomalies, Provides mean
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How do we know if results are reliable?
Not scattered on a graph (obvious trend), Large sample size, Another scientist conducted experiment and has same results
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What do scatter graphs show?
Positive, Negative or No CORRELATIONS
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What is standard deviation?
Gives information about Spread About The Mean. small sd= little variation about the mean
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Why do we carry out stats tests?
See if there is a Signifcant Difference due to change (between data) To see how well results support hypothesis
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Why is data often shown as %?
It's easier for Comparison (always use an example in text)
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What if data is given as 'per 1000'?
It's easier for Comparison
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How reliable is data from questionnaires?
Not very! People often lie or go for the middle and give answer they think they should. UNRELIABLE
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What is a placebo?
Drug withoutactive ingredient, but looks, tastes and packaged same as experimental drug
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What is a double blind study?
Neither groups of patients OR Medical professionals know what group has placebo. This reduces effects of bias
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Why should we back up results with research from secondary resources?
Experimenter could be bias
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Other cards in this set

Card 2

Front

What is the dependent variable?

Back

Measured variable

Card 3

Front

Why could there be a control investigation?

Back

Preview of the front of card 3

Card 4

Front

What is range?

Back

Preview of the front of card 4

Card 5

Front

Why do we repeat experiments?

Back

Preview of the front of card 5
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