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.
An example of a homeostatically controlled variable: blood levels of glucose in a human.
It is important for new employees to know the location of all fire extinguishers. (B) Aim low toward ...
The number of research articles published on the topic of religious practices and spirituality have ...
Overview of a computer-controlled high-pressure common rail V-8 diesel engine.
For the circuit in Figure 1, assume ideal diodes. The peak inverse voltage is approximately
Polygenic inheritance of wheat kernel color controlled by two additive genes