Answer to Question 1
By assigning participants to groups on the basis of the flip of a coin, numbers drawn from a hat, or a table of random numbers, the chance is increased that characteristics other than the independent variable will be equally distributed across treatment groups.
Answer to Question 2
The rate and expression of childhood symptoms and disorders often vary in relation to demographic and situational factors, such as socioeconomic status (SES) (e.g., the social, economic, and physical environment in which the child lives as reflected in measures such as family income, education, or occupation); parents' marital status; and the child's age, gender, and cultural background, to name but a few. Consequently, these variables must be assessed and controlled in most studies.
Rituals such as the sacrament of the Anointing of the Sick are important expressions of religious be
Vesalius’s De Humani Corporis Fabrica was an important early work on the human species.
Nursing Research
Juvenile buzzard being weighed for research
Some human traits controlled by a single gene
Research Methods