Incorrectly Comparing Student Test Scores of Various Countries

…97 percent of all Singaporean students, nearly 90 percent of South Korean primary students and about 85 percent of Hong Kong senior secondary students receive tutoring.

Tutoring Spreads Beyond Asia’s Wealthy

When comparing test scores of various countries, are they comparing similar samples?  No.  Just one (of many) confounding variable that needs to be controlled for is the amount of private tutoring each group of students receive.

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