interviewed in that hour, so survey lasts for 3 days with 12 hours per day to make sure get 80 samples. Lots of patients at the Royal Melbourne Hospitals are from overseas and don’t speak English. The hospital would like to understand the satisfaction of these overseas customers with their in-patient experience by recruiting 200 previous patients to answer a survey sampling frame: list [hospital's internal record of previous overseas customers who don’t speak English with in-patient experience] Survey method: email Sampling technique: stratified sampling [ each region is a stratum and randomly pick a number of customers from each region] Why: The hospital has records of past patients, so they can figure out customers' email address. Customers may be from different countries with different languages, so telephone survey may have communication problems and take more time and money. Therefore, email may be better choice. As customers from different regions are heterogeneous and customers from the same region are homogeneous and each region may have very different consumer sizes, the stratified sampling is appropriate.
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- Little Sichuan, Yingchao Han