For each of the following research situation, propose an appropriate sampling frame (list or set of instructions), survey method, sampling technique

1. For each of the following research situation, propose an appropriate sampling frame (list or set of instructions), survey method, sampling technique and a brief explanation for why the proposed sampling plan is appropriate.
2. The Little Sichuan restaurant in QV would like to understand customer satisfaction with its new menu offerings by recruiting 80 diners to answer a survey

Appropriate,

1. 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

A Monash researcher wants to recruit 12 unlicensed sex workers to conduct in-depth interviews for a report to better inform policy makers on this issue (for this scenario, just propose a sampling technique. No need to talk about sampling frame or survey method)