it is a type of empirical investigation. Most often this type of research is expressed in numbers.

it is a quantitative research method used for collecting data from a set of respondents. It uses interview, questionnaires, and sampling pools.

test for relationship between two variables

it is oftentimes as a survey or normative approach to study prevailing conditions.

states the differences or similarities between among people, things, objects, etc.

it is a design that begins after an event has occurred and without the interference of the investigator.

it is a random selection of participants. Bias-free

the researcher changes or watches an independent variable, but the participants are not put into groups at random.

is the term that researchers use for a measurement device...

refers to the ease with an instrument can be administered, interpreted ....

Two types of validity

can be thought of as consistency.

4 Scales of measurement

it is the systemic, theoretical analysis of the methods applied to a field of study.

age, gender, racial composition.

it is a systemic approach to investigations during which numerical data is collected

the actual set of participants selected for investigation...

characteristics of the participants

the score/label of a variable