Correlation matrix of marks for five exams, two with closed books and three with open books (Mechanics (C), Vectors (C), Algebra (O), Analysis (O) and Statistics (O)).
A matrix of correlations
Mardia et al., Table 1.2.1
Mardia, K.V., Kent, J.T. and Bibby, J.M. (1979) Multivariate Analysis, Academic Press London.
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