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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 Japan4.29
4 France 4.21
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 = -1.392468 X +12.295
Correlation coefficient (r)-0.880
Coefficient of determination (R2)0.774

GDP per capita (current US$)
No. of data10
Regression equation
Y = -44349.925834 X +228592.150
Correlation coefficient (r)-0.803
Coefficient of determination (R2)0.645

Life expectancy at birth - Both sexes (years)
No. of data10
Regression equation
Y = 3.416519 X +68.160
Correlation coefficient (r)0.388
Coefficient of determination (R2)0.151

Fertility rate, total (births per woman)
No. of data10
Regression equation
Y = -0.791358 X +4.685
Correlation coefficient (r)-0.696
Coefficient of determination (R2)0.484

Suicide, age-standardized (per 100 000 population)
No. of data10
Regression equation
Y = 4.299663 X -6.318
Correlation coefficient (r)0.244
Coefficient of determination (R2)0.060