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chi-square a statistical method that determines to what degree the differences between expected data and data actually derived can be ascribed to chance, rather than to some general cause or principle.
Ho Chi Minh a Vietnamese political leader and president of North Vietnam in 1954-69 (b.1890--d.1969).
Ho Chi Minh City a seaport in southern Vietnam, formerly Saigon, the capital of South Vietnam.
tai chi a Chinese system of slow and methodical physical exercises, developed as a method of self-defense, and as an aid to meditation.