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Johnny is a product development manager at a multinational furniture company. He is planning to launch a new furniture line in several Asian markets by the end of 2017. Before launching the new line Johnny wants to conduct a survey on the popularity of the new product. He has identified two markets, Hong Kong and Taiwan, for this survey. He finds that many polling companies use a sample size of 400 or 1000. Given the time and budget constraints, he decides to survey 400 people in Hong Kong, and 1200 people in Taiwan. He chooses a bigger sample size for Taiwan because the population of Taiwan is roughly 3 times than that of Hong Kong. a) Suggest reason(s) why polling companies often use a sample size of 400 or 1000. b) Briefly comment on Johnny's choice of sample size in Hong Kong and Taiwan