Making Statistics Relevant is a brilliant website from the same creator as the RISPS resources – Jonny Griffiths. Each statistics topic has an extension task created to get students using their problem solving skills. Topics covered include measures of central tendency, probability, discrete random variables, poisson distribution, binomial distribution, normal distribution and chi squared. Great for providing varied non-textbook material and for stretching gifted and talented students.
To give an idea of the kind of tasks provided, here is one below. (Worked answers are also provided).