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 read through the text, underlining the most important sentences. Then I write them in my own words as a summary.
Choices: 1 "Not useful at all" - 6 "Very useful"
Data: Average score
Period:
Area:
10 countries/ areas
Highlight:
1 Republic of Korea4.61
2 Italy4.44
3 Japan 4.40
4 Germany4.27
5 United Kingdom4.18
6 United States4.11
7 France4.07
8 Australia4.01
9 Canada3.87
9 Sweden3.87

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 = -1.674812 X +13.771
Correlation coefficient (r)-0.861
Coefficient of determination (R2)0.741

GDP per capita (current US$)
No. of data10
Regression equation
Y = -35486.826566 X +198174.696
Correlation coefficient (r)-0.743
Coefficient of determination (R2)0.552

Life expectancy at birth - Both sexes (years)
No. of data10
Regression equation
Y = 2.245480 X +72.497
Correlation coefficient (r)0.281
Coefficient of determination (R2)0.079

Fertility rate, total (births per woman)
No. of data10
Regression equation
Y = -0.842873 X +4.988
Correlation coefficient (r)-0.751
Coefficient of determination (R2)0.564

Suicide - all ages (per 100,000 population)
No. of data10
Regression equation
Y = 9.339683 X -25.098
Correlation coefficient (r)0.386
Coefficient of determination (R2)0.149