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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:
2 Italy4.42
3 France 4.32
4 Germany4.31
5 Japan4.27
6 United States4.23
7 Canada4.13
9 United Kingdom4.08

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 data7
Regression equation
Y = -1.394320 X +12.512
Correlation coefficient (r)-0.558
Coefficient of determination (R2)0.311

GDP per capita (current US$)
No. of data7
Regression equation
Y = -40956.153576 X +224856.304
Correlation coefficient (r)-0.309
Coefficient of determination (R2)0.095

Life expectancy at birth - Both sexes (years)
No. of data7
Regression equation
Y = 3.593969 X +66.235
Correlation coefficient (r)0.199
Coefficient of determination (R2)0.040

Fertility rate, total (births per woman)
No. of data7
Regression equation
Y = -0.315919 X +2.817
Correlation coefficient (r)-0.174
Coefficient of determination (R2)0.030

Suicide, age-standardized (per 100 000 population)
No. of data7
Regression equation
Y = -7.886045 X +42.987
Correlation coefficient (r)-0.272
Coefficient of determination (R2)0.074