PISA – Australia and China Maths

Australian sample is randomly chosen from 720 school forming a sample of 14,000 students.
China sample is not random. It is skewed to the brightest students across 4 provinces nominated by the Chinese Government. This is the exception all other countries are sampled randomly.
 







The above shows the trend using the full Y-axis rather than exaggerating the decline by using a restricted access.

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