1. Chatfield, C. (1982) Teaching a course in applied statistics, Applied Statistics, 31, 272–89.
2. Hills, M. and the M345 Course Team (1986) M345 Statistical Methods, Unit 1: Data, distributions and uncertainty, Milton Keynes: The Open University. Tables 2.1 and 2.4.
3. Darwin, C. (1876) The Effect of Cross-and Self-fertilization in the Vegetable Kingdom, 2nd edition, London: John Murray.
4. Lewis, T. and the M345 Course Team (1986) M345 Statistical Methods, Unit 2: Basic Methods: Testing and Estimation, Milton Keynes: The Open University, 16.
5. Williams, E.J. (1959) Regression Analysis, New York: John Wiley & Sons, 17.