Write 100-150 words on each of the following

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Write 100-150 words on each of the following. Each question is worth 5 marks.

With APA reference 

1.            What are the advantages of conducting qualitative research in marketing?

2.            Explain some of the principles for running an effective focus group.

3.            What role do (a) control, and (b) randomization play in the design of an experiment?

4.            What is the key difference between probability sampling methods, and non-probability sampling methods? Provide a description of one example of a probability sampling method, and a description of one example of a non-probability sampling method.

5.            Name three common measures of central tendency in statistical analysis. Explain how each measure is calculated, and when it is appropriate to use each measure.