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Principles of Research and Application of Research Methods

Validity: specific validity issues and ways of dealing with issues of validity

  • 3 things to know
  • AS Unit 2

Overview

Recall questions on researcher bias, demand characteristics and social desirability.

What you need to know

Answer each one before you reveal it.

Your recallNot started
Evaluation

Define demand characteristics and researcher bias, and explain how a double blind procedure counters both.

Study

Define social desirability, and explain how a single blind procedure and an independent groups design reduce demand characteristics.

Key term

Define researcher bias.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Define researcher bias.

    Model answer

    Researcher bias is when the expectations of the researcher influence how the study is designed, run, recorded or interpreted, shifting the results towards the hypothesis.

  2. 2

    Give one example of how a researcher might unintentionally bias the results.

    Model answer

    They might unconsciously give more encouragement to participants in the condition they expect to do better, improving that group's performance.

  3. 3

    What is a double blind procedure, and how does it protect validity?

    Model answer

    Neither the participant nor the researcher dealing with them knows which condition the participant is in, so neither the participant's guesses nor the researcher's expectations can shape the results.

  4. 4

    Define demand characteristics.

    Model answer

    Demand characteristics are cues within a study that allow participants to work out its purpose, so they alter their behaviour instead of acting naturally.

  5. 5

    Describe two opposite ways participants may react to demand characteristics.

    Model answer

    Some try to be helpful and behave as they think the researcher wants, while others deliberately do the opposite in order to spoil the results.

  6. 6

    How does a single blind procedure reduce demand characteristics?

    Model answer

    Participants are not told the true aim or which condition they are in, so they have far less information from which to guess what is expected.

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