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Data Handling, Statistics and Mathematical Skills

Inferential statistics: Mann Whitney U test and Critical values from tables

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Overview

Recall questions on Mann Whitney U test and Critical values from tables.

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Key term

When is the Mann Whitney U test the correct choice?

Key term

A study compares recall scores between two separate groups of participants using ranked data. Name the test and justify the choice.

Key term

A study records for each participant whether their mood improved after an intervention compared with before it. Name the test and justify the choice.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    When is the Mann Whitney U test the correct choice?

    Model answer

    When testing for a difference between two conditions using an independent groups design with data that are at least ordinal.

  2. 2

    When is the Wilcoxon matched pairs signed ranks test the correct choice?

    Model answer

    When testing for a difference between two conditions using a repeated measures or matched pairs design with data that are at least ordinal.

  3. 3

    When is the Sign test the correct choice?

    Model answer

    When testing for a difference using a repeated measures or matched pairs design where the data are nominal, such as whether each participant improved or did not.

  4. 4

    When is Spearman's rank order correlation coefficient the correct choice, and what values can it take?

    Model answer

    It is used when testing for a relationship between two co-variables that are at least ordinal, and it can take any value from −1 to +1.

  5. 5

    What three questions decide which inferential test to use?

    Model answer

    Is the study looking for a difference or a relationship, is the design related or unrelated, and what is the level of measurement of the data.

  6. 6

    A study compares recall scores between two separate groups of participants using ranked data. Name the test and justify the choice.

    Model answer

    Mann Whitney U should be used, because the study tests for a difference, the design is independent groups, and the data are ordinal.

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