Small samples confidencce intervals on common mean of two normal distributions variances

Let X₁,X₂,…,X_m be distributed normally with mean μ and variance σ² _X; Let Y₁,Y₂,…,Y_n be distributed normally with mean μ and variance σ² _Y; let X₁,X₂,…,X_m,Y₁,Y₂,…,Y_n be jointly independent. There have been several papers written concerning point estimation of μ for this problem, but very little is available in the literature concerning confidence intervals on the common mean μ. In this paper a method is proposed that results in a confidence interval with confidence coefficient essentially equal to a prescribed value 1 - α. The method is evaluated and compnred with other methods through the expected length of the confidence interval.     

Parental unemployment and children's educational attainment: How big is the role of aspirations?

Children exposed to parental unemployment have been found to lag behind in school, but research has struggled to pin down the underlying explanation. One hypothesis is that parental unemployment may dampen children's aspirations to do well and go far in school. Yet, few studies on parental unemployment have relied on actual measures of children's aspirations or devised a formal analysis of this mechanism. Using the UK Household Longitudinal Study (Waves 1–12, N = 1067), I investigate the role of educational aspirations in children's General Certificate of Secondary Education (GCSE) attainment. I compare adolescents exposed to parental unemployment before or only after the typical age at which GCSE exams are taken. In adjusted models, children exposed to parental unemployment before their GCSEs are around 6 percentage points less likely to attain any GCSE qualification by age 17. On average, children have high educational aspirations, although intentions to enrol in college or university are relatively lower among children exposed to an early spell of parental unemployment. Nevertheless, a hypothetical intervention setting these aspirations to the same level for all children only accounts for a modest portion of the educational penalty tied to an early spell of parental unemployment. Several sensitivity and robustness tests support this conclusion. This note seeks to stimulate more research on the mechanisms underpinning the intergenerational effects of unemployment. Findings cast doubts on the idea that children's aspirations, the target of broader policy discourse and interventions, are a crucial part of the equation.     

Daily moods,health routines and recovery among employees working in the retail and services sector: A diary study

This study examined the quality and fluctuation of daily moods as well as health routines and means of recovery from work strain among employees (n = 38) working nonstandard, often unpredictable schedules in the retail and services sector in Finland. Data were collected via a background questionnaire and a one-week mobile diary. The results indicated that the daily moods of employees were relatively positive but varied greatly from day to day. Hectic working days, unpredictable changes in work schedules, and compounded responsibilities at home and work were reported as causes of daily strain stemming from work. In contrast, more sleep and exercise were positively associated with daily mood and, therefore, are likely to enhance recovery from work related strain. Additional activities employees reported as useful in recovering from work strain included low-effort leisure activities along with social activities with family and friends, as well as mastery experiences stemming from successful work experiences.