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Data Handling, Statistics and Mathematical Skills

Inferential statistics: Chi Square test

  • 3 things to know
  • Component 2

Overview

Recall questions on Inferential statistics: Chi Square test.

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Key term

State the three pieces of information needed to read a critical value from a table.

Key term

State the meaning of the symbols ≤ and ≥.

Key term

State the meaning of the symbols ∝ and ≈.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is the purpose of an inferential statistical test?

    Model answer

    It decides whether a difference or relationship found in the sample is statistically significant or whether it is likely to have arisen by chance.

  2. 2

    What is a probability value in the context of a statistical test?

    Model answer

    It is the probability that the result obtained would have occurred by chance alone if there were no real effect.

  3. 3

    What does a significance level of p ≤ 0.05 mean?

    Model answer

    It means there is a 5% or smaller probability that the result was due to chance, which is conventionally accepted as significant.

  4. 4

    When would a researcher choose the more stringent 0.01 level?

    Model answer

    When being wrong would matter a great deal, such as in medical or drug research, or when checking an unexpected or previously unreplicated finding.

  5. 5

    What is an observed value?

    Model answer

    It is the number produced by carrying out the calculation for the chosen test on the collected data, also called the calculated value.

  6. 6

    What is a critical value?

    Model answer

    It is the value read from a statistical table that the observed value must be compared against to decide whether the result is significant.

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