Experimental Design Flashcards
stat test for post test only ratio
unpaired t-test
stat test for post test only ordinal
Mann- Whitney U test
Example of Post test only design
DV- LOS cost in hospital.
IV- 2 levels PT or no PT
use unpaired t test because its ratio (time)
Single factor pretest posttest stat analysis ratio/ ordinal?
unpaired t test
Mann-Whitney U
Example of Single factor pretest posttest control design
sample is randomly assigned to an experimental group and a control group. they are pretested. the experimental group gets the intervention. control group does not get intervention (or they get a placebo) *basic structure of a randomized controlled trial
Two group pretest-posttest design stat analysis ratio/ordinal?
Unpaired t-test or mann-Whitney U
multigroup pretest posttest stat analysis ratio/ordinal?
one-way anova/ kruskal-wallis Anova
one group pretest-posttest stat test ratio/ordinal
paired t test
Wilcoxon signed-rank test
multifactoral 2x2 design stat ratio/ordinal
2 way anova or 2 way ancova
one way repeated measure stat analysis ratio/interval
one way repeated measure anova/ Friedman Anova
mixed design stat analysis ratio/ordinal
two way anova with repeated measure / mixed ancova
When would you use a two group pretest-posttest?
when comparing a new intervention and standard care
*does not allow researcher to show that treatment works better than no intervention
How many IV in a multigroup pretest posttest?
1 with 3 or more levels
Example: Type of stretching
Dynamic, Static, none
Why is one group pretest posttest quasi experimental?
it does not have a comparison group
Example of a one group pretest posttest
Is there a difference in mile run time between one group of cyclists if they are trained in a certain way between pretest and posttest
If there are more than just a pre test and post test in a one group pretest post test, which stat test would you use
one way anova
When would you use a factorial design
when there are 2 or more IV
Example of a multifactorial 2x2 design
IV - setting and time
levels - inpatient, outpatient (setting). 1hr/wk, 4hr/wk (time)
4 TOTAL groups
2 way anova
in a one way repeated measure design, subjects act as their own…
control
example of one way repeated measure
one group exposed to all levels of one independent variable
cane study. IV-cane Levels - same side, opposite, w/max effort
in a 2x4 mixed model design, how many IV are there
- one IV has 2 levels, one has 4(time usually)
Test where pre-test is impractical
post test only
