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Mathematics, 19.09.2019 21:20, lilbanks4
The manufacturer of the colorsmart-5000 television set claims 95 percent of its sets last at least five years without needing a single repair. in order to test this claim, a consumer group randomly selects 420 consumers who have owned a colorsmart-5000 television set for five years. of these 420 consumers, 303 say their colorsmart-5000 television sets did not need a repair, whereas 117 say their colorsmart-5000 television sets did need at least one repair. (a) find a 99 percent confidence interval for the proportion of all colorsmart-5000 television sets that have lasted at least five years without needing a single repair.
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