Significance of tests.
Minimum of four intervals

• High maths, high divergent production (DP)
• Low maths, high DP
• High maths, low DP
• Low maths, low DP

• High/low maths: achieved A level / achieved GCSE?
• High/low DP: 50/50 cut of test results? What is distribution of test results?

Divide people into groups of high maths and low maths

Null hypothesis: in each group there should be equal numbers of high DP and low DP people.

• Significance of tests
• Convergence and Divergence
• Guilford's 'structure of intellect' model