Advantage of Personally administered questionnaires is Doubts can be
Advantage of Personally administered questionnaires is ;
Doubts can be
clarified
Wide geographic regions can be reached.
Can reach globally
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Disadvantages of electronic questionnaires is ;
People find invitations via e-mail rude and offensive; mails are deleted or people complain
Very inexpensive.
Explanations may introduce a bias.
Almost 100% response rate ensured.
————–is evidence of the extent to which X and Y occur together or vary together in the way predicted by the hypothesis.
Covariation
Time order of occurrence of variable
Elimination of other possible causal factors
A logical explanation
———————-is ;determination ;of whether the effect is actually caused by the manipulation of treatments and not by other, exogenous variables
Internal validity
External validity
Testing effects
Instrumentation effects
———————is the experiment itself affect the responses
Testing effects
History effects
Maturation effects
Instrumentation effects