ISA How Science Work questions

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What is the importance of Control Variables?
To make sure only one factors effects is observed.
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Why do you need a control group?
They are used to make a comparison with those that have the independent variable effecting them.
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Why should you use a large sample size?
To gain more reliable data.
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How do you collect data carefully?
They are grouped randomly to avoid bias.
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Why do you repeat measurements?
To spot anomalous data so it can be removed before a mean is calculated.
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How many repeats should you do?
Usually 5 or until concordancy occurs.
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Because correlation occurs does it mean the two variables are linked?
No, correlation does not mean causation.
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Why do you calculate percentage change?
It allows you to have different mass numbers in the starting group.
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Other cards in this set

Card 2

Front

Why do you need a control group?

Back

They are used to make a comparison with those that have the independent variable effecting them.

Card 3

Front

Why should you use a large sample size?

Back

Preview of the front of card 3

Card 4

Front

How do you collect data carefully?

Back

Preview of the front of card 4

Card 5

Front

Why do you repeat measurements?

Back

Preview of the front of card 5
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