A good Questionnaire usually has ---------- parts?

(a)  

Write at least one main part that a good questionnaire must have

Tell us what demographics means in your own best words

You may choose to interview a non expert but someone with experience on the topic. Give us an example of a situation when you would do that.

How would you usually select a Focus Group?

What does "Informed Consent mean"?

What is the difference between "observation in media" and "field observation". You may use an example.