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In this paper, we develop interval-valued intuitionistic fuzzy (IVIF) confidence intervals for population mean, population proportion, differences in means of two populations, and differences in proportions of two populations. The developed IVIF intervals can be used in cases of both finite and infinite population sizes. The developed fuzzy confidence intervals are equivalent decision-making tools to fuzzy hypothesis tests. We apply the proposed confidence intervals to the differences in the mean lives and failure proportions of two types of radiators used in automobiles, and a sensitivity analysis is given to check the robustness of the decisions.<\/jats:p>","DOI":"10.1515\/jisys-2017-0139","type":"journal-article","created":{"date-parts":[[2017,7,21]],"date-time":"2017-07-21T06:01:09Z","timestamp":1500616869000},"page":"307-319","source":"Crossref","is-referenced-by-count":8,"title":["Interval-Valued Intuitionistic Fuzzy Confidence Intervals"],"prefix":"10.1515","volume":"28","author":[{"given":"Cengiz","family":"Kahraman","sequence":"first","affiliation":[{"name":"Department of Industrial Engineering , Istanbul Technical University , 34367 Macka , Besiktas, Istanbul , Turkey"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Basar","family":"Oztaysi","sequence":"additional","affiliation":[{"name":"Department of Industrial Engineering , Istanbul Technical University , 34367 Macka , Besiktas, Istanbul , Turkey"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sezi","family":"Cevik Onar","sequence":"additional","affiliation":[{"name":"Department of Industrial Engineering , Istanbul Technical University , 34367 Macka , Besiktas, Istanbul , Turkey"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"374","published-online":{"date-parts":[[2017,7,21]]},"reference":[{"key":"2025120523300478175_j_jisys-2017-0139_ref_001_w2aab3b7c10b1b6b1ab1b6b1Aa","doi-asserted-by":"crossref","unstructured":"R. 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