28 Inferential stats continued Flashcards
why need inferential stats?
if want to draw correlations tween variables generalizable to pop.
selection of inferential stat tests determined by:
1) scale of msmt to obtain data
2) # of groups
3) if msmts on independent subjects or related samples
4) assumptions involved in a stats test
tests for nominal and ordinal data are _____, interval/ratio are ____
non-parametric; parametric
what is parametric?
requires assumptions for populations from which samples drawn
in addition to statistical significance, need to consider:
effect size and social/clinical significance
what is effect size?
how large relationships or diffs in data
what is social/clincial significance?
cost of effectiveness, quality of life
what is stat power analysis used for?
know how likely a miss is to occur
factors affecting power?
size of diff between means, significance lvl, sample size, variance, other factors (like normaility, procedure, one or two tails)
what is best defense against low power?
good sized sample
for researcher, ___ error is more acceptable while for clinician ___ error is more acceptable
type 2; type 1
