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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, you will explore how precision in measurements reduces random error and helps you collect data you can trust when analysing experiments and investigations.

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(quiz starts below)

Fascinating Fact:

Careful technique, such as reading scales at eye level and timing correctly, improves precision. Poor technique increases random error and reduces precision.

In GCSE Biology, you often repeat measurements and carefully read equipment scales. Improving precision makes your data more reliable and helps you draw stronger conclusions from your experiments.

Key Terms

  • Precision: How close repeated measurements are to each other when an experiment is repeated in the same way.
  • Random error: Unpredictable differences in measurements caused by small changes in conditions or technique.
  • Resolution: The smallest change a piece of equipment can detect, such as 0.1 cm on a ruler.

Frequently Asked Questions (Click to see answers)

What does precision mean in GCSE Biology experiments?

In GCSE Biology, precision describes how close your repeat readings are to each other. If your measurements are very similar each time, your results are precise, even if they are slightly wrong.

How can I make my practical results more precise?

You can improve precision by repeating measurements, reading scales at eye level, starting timers accurately and using equipment with a finer resolution, such as a stopwatch to 0.01 s.

What is the difference between precision and accuracy in science?

Precision is about how close repeat results are to each other, while accuracy is about how close results are to the true value. Results can be precise but still inaccurate if there is a systematic error.

Try These Related Quizzes

1 .
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
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 .
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
4 .
Precision means that the measurements are...
anomalous
unreliable
repeatable
inaccurate
It is measured as a percentage
5 .
Unreliable data will have a large...
mean
data
range
value
A large range gives a lower percentage for the precision
6 .
Increasing the sample size can increase this.
Accuracy
Results
Validity
Precision
Repeating an experiment many times is a technique used to improve precision
7 .
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
8 .
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
9 .
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
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 Davidson (GCSE Biology Teacher & Examiner, Quiz Writer)
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