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Background Information Rundown (draft from the Hong Kong Federation of Trade Unions, Chinese pdf format only) Highlights of Robert Chung Ting-yiu』s speech (in ppt format) Teaching aid:Standard error of percentage (Excel document) Teaching aid:ESOMAR/WAPOR Guide to Opinion Polls (abstract, in pdf format) Reference:20 Questions a Journalist Should Ask About Poll Results (Chinese translation, pdf format only) Reference:The Freedom to Publish Opinion Poll Results (Chinese translation, pdf format only) Reference document:Who』s Afraid of Election Polls? (Chinese translation, pdf format only) Reference document:Chinese Translation Notes of the previous three reference documents Photos