Biology AS Level EMPA Prep

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  • Created by: Sophie
  • Created on: 19-03-14 17:57
Why do repeats improve reliability?
reduce effect of anomalies, gives reliable mean
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What do you pick out when describing results?
general trend and specific quoted data
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What does standard deviation show?
spread of data about/around the mean
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Where should the independent variable appear in tables and graphs?
left-hand column of tables, x-axis of graphs
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How can data be standardised?
record/maintain time taken to do something or between doing things. use the same number of repeats each time and make clear how many have been done
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When should plotted points be joined with straight lines?
when you are unsure about intermediate values
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How can accuracy be improved?
by using measuring instruments with a higher resolution
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What are anomalies?
results that are not judged to be part of the variation caused by random uncertainty
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How do you obtain valid data?
by controlling variables other than the independent variable
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What should you consider when evaluating a conclusion?
Correlation- what relationship is there between variables and what does this show? Reliability- have repeats been done/has a large-scale trial been used? Consider other contributing factors/variables.
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How should control groups be treated?
they should be given a placebo but treated the same.
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Other cards in this set

Card 2

Front

What do you pick out when describing results?

Back

general trend and specific quoted data

Card 3

Front

What does standard deviation show?

Back

Preview of the front of card 3

Card 4

Front

Where should the independent variable appear in tables and graphs?

Back

Preview of the front of card 4

Card 5

Front

How can data be standardised?

Back

Preview of the front of card 5
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Comments

Hajra

Thanks soooo MUCH!!!!! ;D

Sophie

you're welcome! these were just some things I often got wrong haha

Curlot

This is great, very useful thank you :D

aroojyousaf

this has been so useful as I am bad at the practical side of biology. thank you! 

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