basic stats Flashcards
what are composite variables?
test scores based on the sum of two or more items
how does correlation effect composite variables?
as correlation increases, so does the corresponding composite score variance
how is variance maximised for dichotomously scored items?
when half the people get a question right and half dont
what are relative interpretations?
based on the analysis of data
what are abstract interpretations?
based on the theoretically relevant characteristics of the body of research which supports the test scores as valid indicators of a construct
what can z scores be used for?
to compare scores across tests that are on different sized units
what are percentile ranks?
indicate the percentage of scores that are below specific test score
what is the benefit of negatively keyed items?
prevents people from getting into a response set by mixing between negatively keyed and positively keyed
