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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.

Your recallNot started
Numbers

Mean recall rises from 8 words in the control condition to 11 words in the experimental condition. What is the percentage increase?

Key term

A participant gives 51 correct responses out of 60 on a categorisation task. What percentage is correct?

Numbers

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. 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. 2

    12% of a sample of 250 participants withdrew before the study finished. How many participants was that?

    Model answer

    30 participants withdrew.

  3. 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. 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. 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. 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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Psychology Past to Present — The Five Approaches
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Mathematical Requirements for Psychology (Appendix A: AS Unit 2 and A2 Unit 4)

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