Working scientifically: variables, evidence and conclusions
Learn Working scientifically: variables, evidence and conclusions for Year 9 pupils (ages 13–14). Free practice questions, lessons and worked examples — aligned to the UK National Curriculum.
What you'll learn
- 1
A fair test changes ONE thing and keeps everything else the same.
- 2
Testing whether light affects plant growth: change the light (independent), measure the height (dependent), keep water, soil, pot size and temperature identical (control).
- 3
In that experiment, what is the dependent variable?
- 4
Repeating readings does not remove a systematic error. If the balance reads 2 g heavy every time, ten repeats give you the same wrong answer more precisely.
- 5
What do repeat readings actually reduce?
- 6
Apply it: a correlation is not a cause. Ice cream sales and drowning both rise together — because hot weather causes both. A third factor explains the link.
- 7
Two things rise together. What can you conclude?
Practise Working scientifically: variables, evidence and conclusions with Whizlo
Free AI-tutored lessons, unlimited practice questions, and progress tracking for ages 13–14. Aligned to the UK National Curriculum.