What are the key steps in developing a sampling plan, and how does the choice between probability and nonprobability sampling methods influence the reliability of research results?

(200-300 words)

-Promotions are a very common tool used by companies to gauge market share and generate trial. From the different promotions you observe in Hypermarkets, which do you think are the key failures on a view of an ROI mindset?

(200-250 words)