Correlational finding on Happiness and subject: School performance

StudyOECD (2017): study QA 2015
TitlePISA 2015 Results. Students' Well-Being. Volume III.
SourceOECD Publishing, 2017, Paris, France
URLhttp://www.oecd-ilibrary.org/education/pisa-2015-results-volume-iii_9789264273856-en
Public15-16 aged, secundary school students, Qatar, 2017
SampleProbability multi-stage random
Non-Response
Respondents N =12083

Correlate
Author's labelSchool performance in science
Page in Source TableIII.3.3a/3.5, p.279,280,281
Our classificationSchool performance
Operationalization
Scientific performance, for PISA, measures the 
scientific literacy of a 15 year-old in the use of 
scientific knowledge to identify questions, acquire new 
knowledge, explain scientific phenomena, and draw 
evidence-based conclusions about science-related 
issues. The mean score is the measure.
Observed distributionDeciles and quartiles

Observed Relation with Happiness
Happiness
Measure
StatisticsElaboration/Remarks
C-BW-c-sq-l-11-eDM=+/- ns
Score decile   Mean Happiness
1                7,44
2                7,54
3                7,58
4                7,47       
5                7,47
6                7,42
7                7,34
8                7,31
9                7,27
10               7,27

Difference 10-1
- all           -0,17 
- boys          +0,06 
- girls         -0.31
C-BW-c-sq-l-11-eDM=- p < .05
Score quarter   Mean Happiness
Bottom          7,52
Second          7,49
Third           7,37
Top             7,27

difference Top-Botom: -0.24


Appendix 1: Happiness measures used
CodeFull Text
C-BW-c-sq-l-11-eSelfreport on single question:

Here is a picture of a ladder. The top of the ladder '10' represents the best possible life for you and the bottom '0' is the worst possible life for you. In general , where on the ladder do you feel you stand at the moment? Tick the box next to the number that best describes where you stand
10 best possible
9
8
7
6
5
4
3
2
1
0 worst possible life


Appendix 2: Statistics used
SymbolExplanation
DMDIFFERENCE of MEANS
Type: descriptive statistic only.
Measurement level: Correlate: dichotomous, Happiness: metric
Range: depending on the happiness rating scale of the author; range symmetric about zero.

Meaning: the difference of the mean happiness, as measured on the author's rating scale, between the two correlate levels.
Source:
Ruut Veenhoven, World Database of Happiness, Collection of Correlational Findings, Erasmus University Rotterdam.
https://worlddatabaseofhappiness.eur.nl