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Question: How do you rate the usefulness of the following strategies for understanding and memorising the text? - I summarise the text in my own words.
Choices: 1 "Not useful at all" - 6 "Very useful"
Data: Average score
Period:
Area:
10 countries/ areas
Highlight:
1 Republic of Korea4.49
2 Italy4.37
3 Japan 4.29
4 France4.21
5 United Kingdom3.93
6 United States3.89
7 Germany3.88
8 Australia3.84
9 Sweden3.83
10 Canada3.78

Note
The data of Azerbaijan are collected only in Baku. The data of China are collected only in Beijing, Shanghai, Jiangsu, and Zhejiang.

Source
OECD PISA 2018 Compendia

Correlations with major national performance indices
Life satisfaction (10 steps)
No. of data10
Regression equation
Y = -1.692029 X +13.620
Correlation coefficient (r)-0.922
Coefficient of determination (R2)0.850

GDP per capita (current US$)
No. of data10
Regression equation
Y = -37817.605829 X +202932.421
Correlation coefficient (r)-0.839
Coefficient of determination (R2)0.704

Life expectancy at birth - Both sexes (years)
No. of data10
Regression equation
Y = 3.555233 X +67.488
Correlation coefficient (r)0.471
Coefficient of determination (R2)0.222

Fertility rate, total (births per woman)
No. of data10
Regression equation
Y = -0.682195 X +4.226
Correlation coefficient (r)-0.644
Coefficient of determination (R2)0.415

Suicide - all ages (per 100,000 population)
No. of data10
Regression equation
Y = 9.467636 X -24.383
Correlation coefficient (r)0.414
Coefficient of determination (R2)0.171