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Data Recording, Analysis and Presentation

Degrees of freedom, choosing a test and mathematical symbols

  • 2 things to know
  • Component 01

Overview

Recall questions on degrees of freedom for Chi-square, the three questions for choosing an inferential test, and the mathematical symbols ∝, ~, < and << used to report relationships and significance.

What you need to know

Answer each one before you reveal it.

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Key term

How are the degrees of freedom found for a Chi-square test?

Key term

What three questions determine which inferential test should be chosen?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    How are the degrees of freedom found for a Chi-square test?

    Model answer

    One less than the number of rows is multiplied by one less than the number of columns in the contingency table.

  2. 2

    A contingency table has two rows and three columns. Calculate the degrees of freedom.

    Model answer

    There are 2 degrees of freedom.

  3. 3

    What three questions determine which inferential test should be chosen?

    Model answer

    Whether the study tests a difference or a correlation, whether the design is related or unrelated, and the level of measurement of the data.

  4. 4

    A researcher writes that recall ∝ revision time. What claim is being made?

    Model answer

    That recall is directly proportional to revision time, so doubling the time spent revising would be expected to double the amount recalled.

  5. 5

    What does the symbol ~ mean when used with a value?

    Model answer

    It means that the value is approximately equal to the one given.

  6. 6

    Distinguish between the symbols < and <<.

    Model answer

    The symbol < means less than, whereas << means very much less than.

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