Three types of descriptive research

case study

naturalistic observation

Hawthorne effect

survey

sampling bias

population

random sampling

wording effects

social desirability bias

self-report bias

correlation

correlation coefficient

variable

scatterplot

positive correlation

negative correlation

bidirectional problem

third-variable problem

illusory correlation

regression toward the mean

experiment

experimental group

control group

random assignment

independent variable

dependent variable

validity

confounding variables

placebo effect

single-blind procedure

double-blind procedure

experimenter bias