Experimental Design

Question 1

stat test for post test only ratio

Answer 1

unpaired t-test

Question 2

stat test for post test only ordinal

Answer 2

Mann- Whitney U test

Question 3

Example of Post test only design

Answer 3

DV- LOS cost in hospital.
IV- 2 levels PT or no PT
use unpaired t test because its ratio (time)

Question 4

Single factor pretest posttest stat analysis ratio/ ordinal?

Answer 4

unpaired t test

Mann-Whitney U

Question 5

Example of Single factor pretest posttest control design

Answer 5

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

Question 6

Two group pretest-posttest design stat analysis ratio/ordinal?

Answer 6

Unpaired t-test or mann-Whitney U

Question 7

multigroup pretest posttest stat analysis ratio/ordinal?

Answer 7

one-way anova/ kruskal-wallis Anova

Question 8

one group pretest-posttest stat test ratio/ordinal

Answer 8

paired t test

Wilcoxon signed-rank test

Question 9

multifactoral 2x2 design stat ratio/ordinal

Answer 9

2 way anova or 2 way ancova

Question 10

one way repeated measure stat analysis ratio/interval

Answer 10

one way repeated measure anova/ Friedman Anova

Question 11

mixed design stat analysis ratio/ordinal

Answer 11

two way anova with repeated measure / mixed ancova

Question 12

When would you use a two group pretest-posttest?

Answer 12

when comparing a new intervention and standard care

*does not allow researcher to show that treatment works better than no intervention

Question 13

How many IV in a multigroup pretest posttest?

Answer 13

1 with 3 or more levels
Example: Type of stretching
Dynamic, Static, none

Question 14

Why is one group pretest posttest quasi experimental?

Answer 14

it does not have a comparison group

Question 15

Example of a one group pretest posttest

Answer 15

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

Question 16

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

Answer 16

one way anova

Question 17

When would you use a factorial design

Answer 17

when there are 2 or more IV

Question 18

Example of a multifactorial 2x2 design

Answer 18

IV - setting and time
levels - inpatient, outpatient (setting). 1hr/wk, 4hr/wk (time)
4 TOTAL groups
2 way anova

Question 19

in a one way repeated measure design, subjects act as their own…

Answer 19

control

Question 20

example of one way repeated measure

Answer 20

one group exposed to all levels of one independent variable

cane study. IV-cane Levels - same side, opposite, w/max effort

Question 21

in a 2x4 mixed model design, how many IV are there

Answer 21

2. one IV has 2 levels, one has 4(time usually)

Question 22

Test where pre-test is impractical

Answer 22

post test only