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  4. Unit 4 - Precision of Data
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Unit 4 - Precision of Data
Increasing the sample size, such as the number of blueberries, can increase precision.

Unit 4 - Precision of Data

In this GCSE Biology quiz we look at precision of data. Precision is a measure of repeatability or reproducibility of scientific measurements. It is the degree to which repeated measurements, under the same experimental conditions, give the same result.

Accuracy is not the same thing as precision. Accuracy is about measurements being as close to the true value as possible. Precision is the measurement being the same value each time the experiment is performed. A measurement system can be accurate but not reliable (precise) or vice versa.

Precision is written as a percentage. It tells you how precisely you can use a piece of equipment to take a reading. It is calculated by subtracting the maximum percentage error from 100%.

1.
If there is a systematic error within the experiment, this will always be a problem.
Precision
Reliability
Factuality
Accuracy
Errors such as poor measuring techniques cannot be improved simply by repetition. The measurements will always lack accuracy
2.
When measurements are both accurate and reliable they are described as...
invalid
valid
correct
incorrect
In the evaluation of your investigations you are expected to say how precise, accurate and valid you think that your results are
3.
Reliable results are just like reliable people, they are always...
at the same time
pleasant
the same
anomalous
Not quite the same but very consistent
4.
Increasing the sample size can increase this.
Accuracy
Results
Validity
Precision
Repeating an experiment many times is a technique used to improve precision
5.
Unreliable data will have a large...
mean
data
range
value
A large range gives a lower percentage for the precision
6.
Precise data will always have a value very close to the...
mean
range
anomaly
edge
This does not necessarily indicate accuracy, it simply means that the method of an experiment produces repeatable results
7.
Resolution of a measuring device is...
the largest change giving a result
the smallest change possible which can give a result
any change leading to a result
the best result possible
Resolution of the human eye is the minimum distance of two dots so the eye can see them as two dots. For most people this is 0.2mm
8.
Precision means that the measurements are...
anomalous
unreliable
repeatable
inaccurate
It is measured as a percentage
9.
Accuracy is...
the same as reliable
the same as precision
unreliable
close to the true value
Results can be of high precision but low accuracy
10.
Another word for reliable.
Precise
Accurate
Anomalous
Unreasonable
Precision and reliability are the same thing in terms of scientific experiments
You can find more about this topic by visiting BBC Bitesize - Practical skills

Author:  Donna Maria Davidson
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