something that can be assumed is present , but it cannot be seen or measured directly

• Single Blind Study

• construct

• variables

• case study

a prediction or assumption about behavior that is tested through scientific research

• sample

• standard deviation

• experiment

• hypothesis

to repeat a research study usually with different participates and in different situations, to confirm the results of the original study

• informed consent

• ethics

• replicated

• positive correlation

a research technique for acquiring data about the attitudes of behaviors of a group of people, usually by asking questions of a representative, random sample

• survey

• naturalistic observation

• placebo

• case study

the total group to be studied or described and from whom samples may be drawn

• laboratory observation

• negative correlation

• target population

• stratified sample

a representative segment of a target population

• sample

• longitudinal method

• cross sectional method

• control group

a surveypopulation, selected by chance, which fairly represents the general population

• sample

• random sample

• variables

• dependent variable

a sample drawn in such a way that known subgroups within a population are represented in proportion to their numbers in the general populatuion

• independent variable

• experiment

• random sample

• stratified sample

predisposition to a certain point of view

• ethics

• bias

• informed consent

• case study

the concept that people who volunteer to participate in research studies often differ from those who do not volunteer

• volunteer bias

• random sample

• cross sectional method

• experimental group