Experimental design 2/surveys, questionnaires

Question 1

What is the Likert Scale and what makes it useful?

Answer 1

he format of a typical five-level Likert item, for example, could be:
Strongly disagree
Disagree
Neither agree nor disagree
Agree
Strongly agree

Its useful because the answers can be quantified and subsequently parametric statistics perfomed (mean, SD etc.)

Question 2

What is the difference between the inductive approach and deductive approach to scale construction? When would you use which?

Answer 2

Inductive Approach = generate items of scale first (used when unfamiliar topic)
Deductive Approac = use theoretical definitions of construct to generate items

Question 3

What is a Factor Analysis?

Answer 3

a statistical method to describe variability among observed correlated variables by using unobserved variables called factors during scale construction

Question 4

What is an Exploratory factor analysis

Answer 4

reduce set of observed variables to a smaller more parsimonious set of variables

Question 5

What is Confirmatory Factor Analysis?

Answer 5

asses the factor structure for overall validity

Question 6

During Scale Exploratory Factor Analysis when are items removed?

Answer 6

When they do not load onto any factors

Question 7

What characterizes a good psychrometric scale (in statistical terms)?

Answer 7

items on one scale should be highly correlated and less corelated with other scales, good items have a HIGH variance (regarding answers to thaat one item)

Question 8

What is used to asses the internal consistency of a scale?

Answer 8

Cronbach’s alpha = degree of interrelation of items of a scale.

Question 9

Does there always have to be a replication at the end of scale construction in order to validate the scale?

Answer 9

Well if the question is asked like this: obv. not.

Replication at end with different sample
OR split group in half
OR use confirmatory factor analysis for replication