Non-parametric significance tests for two dependent samples are used when the researcher wants to study correlated, or matched, samples. This includes the before-after effect and matched paired studies:. McNemarâs test, Test of Marginal Homogeneity, the Sign test, and Wilcoxonâs signed rank test.
The modern family is a smaller family. It is no longer a joint family. Moreover the tendency is to have a smaller family and the contraceptives help in checking the birth.
The nuclear family is a relatively recent phenomenon, becoming common only within the last century. Before then, the traditional family was multigenerational, with grandparents often living with their children on farms as well as in urban environments, typically with other relatives living nearby.