Statistical methods that are used to describe or summarize how scores are dispersed are referred to as:

Personality traits.. .remain stable throughout life ..change at different rates to different degrees ..are more obvious during childhood ..all of the above

Population parameters are difficult to calculate due to

Atherapist at a free university clinic treats elementary school children with behavior problems who are referred by a social service agency. she is also a doctoral candidate who proposes using data she has and will collect about the children for a case-based research project. describe the type of parental permission which is required in this case?