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.
Comparison of Steps of the Nursing Process with the Research Process
Animal carcasses like this South African wildebeest provide important nutrition for both hunters and
A vacuum-operated EGR valve. The vacuum to the EGR valve is computer controlled by the EGR valve ...
The hazmat training pyramid. It is important to train from the ground up, starting with a firm grasp ...
Controlled Scientific Experiments Scientists use experimental research to test hypotheses
Recent research suggests that zinc lozenges and nasal gels may help reduce the severity