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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

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