What do you think has happened in the case of Student B?
These appear to be from the same student. All the pairs of observations are similar except for sex.
One possible explanation is that the student entering the data typed “2” instead of “1” or “1” instead of “2”.
I think this is the most likely explanation, but there is no way to check as the data are anonymised.
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Last updated: 21 July, 2008.