a mean is the average the medium is the number in the midle of the ordered numbers
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Where you order the measurements according to some rule but there is no straightforward relationship between the categories. For example, with measurements classified as: short, medium, tall. It is not possible to say whether the difference between medium and short is smaller than/equal to/larger than the difference between tall and medium.
Sampling bias.
Zero
Random error.
t-test is the statistical test used to find the difference of mean between two groups