WJEC A-Level Psychology 601-5719-7
Psychology Past to Present — The Five Approaches
Contemporary Debates
Principles of Research and Application of Research Methods
Mathematical Requirements for Psychology (Appendix A: AS Unit 2 and A2 Unit 4)
Addictive BehavioursAddictive
Autistic Spectrum BehavioursAutistic spectrum
Bullying BehavioursBullying
Criminal BehavioursCriminal
SchizophreniaSchizophrenia
StressStress
Controversies in Psychology
Applied Research Methods
Mathematical Requirements for Psychology (Appendix A: AS Unit 2 and A2 Unit 4)
Arithmetic and Numerical Computation: estimating and checking a result
- 3 things to know
- AS Unit 2 and A2 Unit 4
Overview
Recall questions on estimating a result and checking a result.
What you need to know
Answer each one before you reveal it.
A participant gives 51 correct responses out of 60 on a categorisation task. What percentage is correct?
12% of a sample of 250 participants withdrew before the study finished. How many participants was that?
Questions from this subtopic
Each one with the model answer underneath.
- 1
A participant gives 51 correct responses out of 60 on a categorisation task. What percentage is correct?
Model answer
The participant scored 85% correct.
- 2
12% of a sample of 250 participants withdrew before the study finished. How many participants was that?
Model answer
30 participants withdrew.
- 3
Mean recall rises from 8 words in the control condition to 11 words in the experimental condition. What is the percentage increase?
Model answer
The increase is 3 words on 8, which is a 37.5% increase.
- 4
The mean number of errors falls from 40 to 34 after training. Calculate the percentage decrease.
Model answer
The decrease is 6 on 40, which is a 15% decrease.
- 5
An observation coded every behaviour into one of three categories: 46% were on-task, 31% were social and the rest were coded 'other'. What percentage were coded 'other'?
Model answer
23% were coded 'other', because the three categories must total 100%.
- 6
What is the proportion 0.28 as a percentage, and as a fraction in its simplest form?
Model answer
It is 28%, which as a fraction in its simplest form is 7/25.
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