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.
While numerous subspecies of the jaguar have been recognized, recent research suggests just three. G
The number of research articles published on the topic of religious practices and spirituality have ...
The Number of Children Americans Think Are Ideal
Sections of a Research Report
Hydrolysis reactions for some biochemically important phosphate compounds (part 2)
Healthy Eating Behaviors and Weight Gain Are Important Considerations during the Third Trimester