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https://news.gallup.com/poll/109228/russian-language-enjoying-boost-postsoviet-states.aspx

Survey Methods Results are based on face-to-face interviews conducted in 2006 and 2007 with approximately 1,000 residents, aged 15 or older, in each country. For results based on the total sample of national adults, one can say with 95% confidence that the maximum margin of sampling error is ±3 percentage points. In addition to sampling error, question wording and practical difficulties in conducting surveys can introduce error or bias into the findings of public opinion polls.