Correlational finding on Happiness and subject: Amount of sleep

StudyPettay (2008a): study US 2006
TitleHealth Behaviors and Life Satisfaction in college Students.
SourcePhD Thesis, Kansas State University, 2008, USA
PublicUniversity students, Illinois, USA, 2007
SampleSampling not reported
Respondents N =796

Author's labelSleep behavior
Page in Source 54-56
Our classificationAmount of sleep
Selfreport on single question:
I get 6 to 8 hours of sleep a night
1: rarely
2: somerimes
3: half the time
4: more frequently than not
5: most of the time

0: 1, 2,3
1: 4, 5

Observed Relation with Happiness
O-Sum-u-mq-v-5-bcMW=+ p < .001
Stronger among males

Appendix 1: Happiness measures used
CodeFull Text
O-Sum-u-mq-v-5-bcSelfreport on 3 questions:

Using the 1-5 scale below, indicate your agreement with each of the items by placing the appropriate number on the line preceding that item. Please be open and honest in your responding.
A In most ways my life is close to ideal
B The conditions of my life are excellent
C I am satisfied with my life

Answers rated:
5 strongly agree
4 slightly agree
3 neither agree nor disagree
2 slightly disagree
1 strongly disagree

Computation:( A+B+C)/3

Name: Shortened Diener's Satisfaction with Life Scale (SWLS)

Appendix 2: Statistics used
Type: statistical procedure.
Measurement level: Correlate: dichotomous, Happiness: ordinal
Symbol test statistic: W (Wilcoxon) or U (Mann-Whitney).
Relationship: W = U + n1(n1 + 1), where n1 and n2 = Ne - n1 , while n1 <= n2, are the sizes of the two samples.
Range U [ 0; n1n2 ] and W [ n1(n1 + 1); n1(n1+ 2n2 +1].

At the limit values of U and W there is the strongest possible association.
U = n1n2 <-> W = n1(Ne + 1) no association.
Ruut Veenhoven, World Database of Happiness, Collection of Correlational Findings, Erasmus University Rotterdam.