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Inferential Testing

The sign test

  • 4 things to know
  • Paper 2

Overview

When the sign test is used, how the calculated value of S is worked out from the data, and how the hypothesis determines the comparison made.

What you need to know

Answer each one before you reveal it.

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Key term

What is the sign test?

Process

How is the sign test calculated?

Key term

How does the hypothesis affect which sign test is used?

Numbers

A study gives 17 plus signs and 13 minus signs. What is the calculated S?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is the sign test?

    Model answer

    A non-parametric inferential statistical test used to determine whether there is a significant difference between two related conditions.

  2. 2

    What type of research design is the sign test used with?

    Model answer

    Repeated measures or matched pairs designs.

  3. 3

    What is the minimum level of measurement required for data to use the sign test?

    Model answer

    Nominal level of measurement.

  4. 4

    Does the sign test look for a difference between conditions or a correlation between variables?

    Model answer

    A difference between conditions.

  5. 5

    When calculating the sign test, what is the first step involving each participant's scores?

    Model answer

    Compare each participant's score in condition A with their score in condition B.

  6. 6

    In the sign test calculation, what sign is assigned if a participant's score increased from condition A to condition B?

    Model answer

    A plus sign.

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