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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.

Explore the Topic →

(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 .

Precision means that the measurements are...

anomalous

unreliable

repeatable

inaccurate

It is measured as a percentage

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 .

Another word for reliable.

Precise

Accurate

Anomalous

Unreasonable

Precision and reliability are the same thing in terms of scientific experiments

4 .

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

5 .

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

6 .

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

7 .

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

8 .

Unreliable data will have a large...

mean

data

range

value

A large range gives a lower percentage for the precision

9 .

Increasing the sample size can increase this.

Accuracy

Results

Validity

Precision

Repeating an experiment many times is a technique used to improve precision

10 .

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

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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