Glossary
qualitative research: extrapolating evidence for a theory from what people say or write (contrast with quantitative methods)
quantitative research: inferring evidence for a theory through measurement of variables that produce numeric outcomes (contrast with qualitative methods)
quartile: values of a set of ordered observations that split those observations into four equal sized groups
quasi-experimental design: a research design in which the experimenter has no control over either the allocation of participants to conditions, or the timing of the experimental manipulations
quota sampling: a quota sample is an attempt to make a sample representative by having the same proportion of different groups of people in the sample and in the population