14 Quasi-Experimental and Naturalistic Designs Flashcards Preview

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Flashcards in 14 Quasi-Experimental and Naturalistic Designs Deck (17)
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1
Q

why use quasi-experimental/naturalistic?

A

experimental not feasible or causal relationship not goal

2
Q

___ design is used to provide reasonable evidence of cause, introduce treatment but no control group

A

quasi-experimental design

3
Q

controls in quasi-experimental?

A

time at which treatment introduced/withdrawn, control group from diff sample

4
Q

repeated observations before and after treatment

A

time-series designs

5
Q

what is time series design steps?

A

1) select appropriate pop. 2) specify dependent variable 3) introduce treatment to decrease risk factor 4) monitor dependent variable

6
Q

example of time series design?

A

introduce package promoting exercise and healthy diet

7
Q

probs of time series design?

A

history threat, probs of internal validity

8
Q

example of multi group time series design?

A

in community A have control, community B introduce health promotion program

9
Q

prob of multi group time series?

A

A and B not equivalent

10
Q

why naturalistic?

A

variables can’t be manipulated, ethically inappropriate intervene, multiple causal/risk factors

11
Q

in naturalistic comparisons, have extraneous variables that can be ____ but not ____

A

controlled ; manipulated

12
Q

identifies interrelationships among variables, expresses numerically the strength of association

A

correlational studies (probabilities)

13
Q

aim to describe accurately characteristics/variables of populations, provide overview of status/patterns in community

A

survey

14
Q

common uses of surveys in health/nutrition:

A

establish attitudes/opinions/beliefs regarding issue, study characteristics of populations, study demographics of health issues/practices

15
Q

what are internal validity probs of naturalistic design?

A

less control over studied phenomena, more difficult exclude alternative explanations/hypotheses

16
Q

what are external validity probs of naturalistic design?

A

strictly should only generalize to pop. from which sample drawn cuz other pop. have factors that change risk

17
Q

how strengthen generalizability?

A

gain more evidence!