Handling Data (AQA A-Level Biology): Flashcards
📚Flashcards
Practise the cards
10 cards from this deck
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Practise the cards
10 cards from this deck
What is estimation in practical work?
What is estimation in practical work?
Educated guess based on understanding of typical measurements
Purpose of estimating results beforehand
Purpose of estimating results beforehand
To identify obvious errors, especially from incorrect data entry
What is uncertainty of measurement?
What is uncertainty of measurement?
Maximum likely error in a measurement
Causes of measurement uncertainty
Causes of measurement uncertainty
Instrument limitations and human error
Uncertainty of a standard mm ruler
Uncertainty of a standard mm ruler
±0.5 mm
Formula for percentage error
Formula for percentage error
% error: 6 mm object, ±0.5 mm ruler
% error: 6 mm object, ±0.5 mm ruler
8.3%
% error: 87 mm object, ±0.5 mm ruler
% error: 87 mm object, ±0.5 mm ruler
0.6%
Why larger objects have smaller % errors
Why larger objects have smaller % errors
Fixed uncertainty becomes smaller proportion of total measurement
Uncertainty of digital balance
Uncertainty of digital balance
±0.01 g
