module 3 experimental and quasi experimental designs

Question 1

Experimental studies vs observational

Answer 1

experimental have

• active agent
• manipulation: intervention/treatment/therapy

Question 2

Experimental designs

Answer 2

true experimental (RCT)
pretest-posttest 
posttest only
factorial 
crossover

Question 3

True experimental (RCT) study

Answer 3

manipulation: implement something
control: dec. bias, do not receive intervention
randomization
blinding: participants don’t know what group they are in

Question 4

pretest-posttest study

Answer 4

DV measured before and after

Question 5

Posttest only

Answer 5

DV only measured after study

Question 6

Factorial

Answer 6

2 or more IV measured, interaction effect

Question 7

crossover

Answer 7

participants exposed to more than one condition in random order

Question 8

quasi experimental designs

Answer 8

pretest-postest non-equivalent
after only non equivalent
one group pretest-postest
time series

Question 9

pretest-posttest non-equivalent study

Answer 9

measures DV before and after, but there was not randomization for groups.

Question 10

After only non-equivalent study

Answer 10

DV measured only after study, no randomization of groups

Question 11

one group pretest-posttest

Answer 11

no comparison group

Question 12

Time series

Answer 12

look at one measurement repeatedly over time

Question 13

experimental designs pro and cons

Answer 13

Pro: est. causality
con: artificial in nature; hard to reproduce naturally, costly

Question 14

quasi-experimental designs pros and cons

Answer 14

Pro: practical, easy to implement, ethical
Con: dec. generalizability