Handling Data (AQA A-Level Biology): Flashcards

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Gathering Data & Making Measurements
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What is estimation in practical work?

Educated guess based on understanding of typical measurements

Purpose of estimating results beforehand

To identify obvious errors, especially from incorrect data entry

What is uncertainty of measurement?

Maximum likely error in a measurement

Causes of measurement uncertainty

Instrument limitations and human error

Uncertainty of a standard mm ruler

±0.5 mm

Formula for percentage error

max errormeasured value×100\frac{\text{max error}}{\text{measured value}} \times 100

% error: 6 mm object, ±0.5 mm ruler

8.3%

% error: 87 mm object, ±0.5 mm ruler

0.6%

Why larger objects have smaller % errors

Fixed uncertainty becomes smaller proportion of total measurement

Uncertainty of digital balance

±0.01 g

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