Mann-Whitney U - Advantages and disadvantages table in A Level and IB Geography

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Created by: Sofalof
Created on: 24-04-15 18:06

Mann-Whitney U

Advantages

States whether the difference is significant or occurred by chance
Shows the median between 2 sets of data
You can use data sets of different sizes
Good with dealing with skewed data so data doesn't need to be normally distrubuted

Disadvantages

Lengthy calculation - prone to human error
Does not explain why there is a difference
More appropriate when the data sets are independent of each other
More appropriate when both sets of data have the same shape distribution
Become less accurate when the sample size is below 5 or above 20

Evaluation

Tests whether there is a significant difference between the median values of 2 sets of data. Is a non-parametric test. The lowest calculated value is taken and must be smaller than the critical value.

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