What are some features of a good questionnaire?
negatively worded questions
discrimination
validity
reliability
What is discrimination?
people who differ in the construct being measured produce different scores
What are the 3 types of validity?
content
construct/factor
criterion
What is reliability?
the ability of the questionnaire to produce the same results under the same conditions
What is content validity?
that the items represent the construct and are all relevant to the theoretical construct
What is criterion validity?
that the scores relate to the criteria variables, other relevant studies and real world observations
What is construct/factor validity?
a statistical way of measuring how valid the underlying structure is
What are some rating scale effects?
having a 1 - 10 scale can produce drastically different results to a -5 to 5 scale
respondent assumes that the average is somewhere in the middle of the response scale
What are some wording issues to avoid?
ambiguity leading questions double negatives double-barrelled questions inducing a response bias order effects
What is concurrent validity?
the level of agreement between the results of a current study and those of a previous similar one
What is predictive validity?
the degree to which a scale is measuring what it intends to measure
What are the three corollaries to consider in discrimination?
people with the same score should be equal to each other along the measured construct
people with different scores should be different to each other along the measured construct
the degree of difference between people should be directly proportional to the difference in scores
