Tweet
Question: You have just read a long and rather difficult two-page text about fluctuations in the water level of a lake in Africa. You have to write a summary.How do you rate the usefulness of the following strategies for writing a summary of this two-page text? - I carefully check whether the most important facts in the text are represented in the summary.
Choices: 1 "Not useful at all" - 6 "Very useful"
Data: Average score
Period:
Area:
10 countries/ areas
Highlight:
1 Republic of Korea4.56
2 Italy4.42
3 France 4.32
4 Germany4.31
5 Japan4.27
6 United States4.23
7 Canada4.13
8 Australia4.09
9 United Kingdom4.08
10 Sweden4.07

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 = -2.070598 X +15.450
Correlation coefficient (r)-0.811
Coefficient of determination (R2)0.658

GDP per capita (current US$)
No. of data10
Regression equation
Y = -54993.071829 X +282541.169
Correlation coefficient (r)-0.617
Coefficient of determination (R2)0.381

Life expectancy at birth - Both sexes (years)
No. of data10
Regression equation
Y = 1.880625 X +74.011
Correlation coefficient (r)0.132
Coefficient of determination (R2)0.017

Fertility rate, total (births per woman)
No. of data10
Regression equation
Y = -1.275768 X +6.898
Correlation coefficient (r)-0.696
Coefficient of determination (R2)0.484

Suicide, age-standardized (per 100 000 population)
No. of data10
Regression equation
Y = 9.369163 X -28.700
Correlation coefficient (r)0.330
Coefficient of determination (R2)0.109