Unit 2 - Methods Flashcards
stratified sampling
a process that allows a researcher to ensure that the sample represents the population on some criteria.
Empiricism
knowledge collected through our 5 senses.
representative sample
selecting an accurate portion of a diverse population. A statistical populist ion that accurately reflects the members of the entire population.
sampling bias
a non random sample. all subjects or participants are not equally likely to be selected.
hindsight bias
when people hear about a research finding and think that they knew it all along.
operational definition
(operationalizing) - explaining how you will measure a variable.
single blind study
occurs only when the participants do not know to which group the substance has been assigned to
double blind study
occurs when neither the participants nor the researcher a are able to affect the outcome of the research
phineas gage
an American railroad constructor who survived a rock blasting accident in which an iron rod was driven completely through his head.
He Influenced nineteenth century discussion about the mind and brain, particularly debate on cerebral localization.
correlation
a relationship between two variables without ascribing cause.
population
anyone or anything that can possibly be selected to be in the sample
validity
is when the research done measures what the researcher set out to measure; it is accurate.
reliability
is when the research can be replicated; it is consistent.
independent variable
is the part of the experiment you can control. this variable effects the outcome results or dependent variable.
dependent variable
is the result or the part of the experiment which you have no control of.