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.
The direction of plant cell expansion is controlled by microfibrils and microtubules. Plant cells en
The approval of a new drug is a four-stage process: (1) preclinical investigation, (2) clinical inve
It is important for new employees to know the location of all fire extinguishers. (C) Sweep the area ...
Important Trace Elements in the Body
Research Design in Clinical Psychology
Operations Research