The R function t.test() can be used to perform both one and two sample t-tests on vectors of data. The function contains a variety of options and can be called as follows: > t.test(x, y = NULL, alternative = c("two.sided", "less", "greater"), mu = 0, paired = FALSE, var.equal = FALSE, conf.level = 0.95) Here x is a numeric vector of data values and y is an optional numeric vector of data values...

background happiness is one of the most important factors affecting women's mental health. several factors contribute to happiness in different societies. objectives the aim of this study was to investigate the level of happiness in married women and its related factors. materials and methods this was a cross-sectional study with stratified sampling proportional to different age groups of marri...

OBJECTIVE To examine the relationship between components of social networks and health-related quality of life (HRQL) in older adults with and without depressive symptoms. MATERIAL AND METHODS Comparative cross-sectional study with data from the cohort study 'Integral Study of Depression', carried out in Mexico City during 2004. The sample was selected through a multi-stage probability design...

The purpose of this study was to explore the differences in perceived stress and coping styles among non-traditional graduate students in both on-campus and distance-learning programs. The study employed a quantitative causal-comparative design that involved collecting survey data. The sample consisted of 36 non-traditional graduate students who enrolled in distance learning classes along with ...

Increasing global notices in environmental protection, green supply chain management (GSCM) has received much attention by researchers and managers more than the past. Commonly, firms have considered cost criteria to select their suppliers. Despite the fact that there are various papers considering the formal criteria in supplier selection, there is a few limited numbers considering the environ...