Advantage of Personally administered questionnaires is
Doubts can be
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
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.
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
———————is the experiment itself affect the responses