B. Find the length of the confidence interval given the following data: 1. o = 0.3, n = 45, confidence level 98% 2. 0 = 0.5, n = 50, confidence level 95% Item 2 only 3. 0= 1.5, n = 70, confidence level 99%

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A: Formula :

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A: c​= 0.95, x= 15.7, o= 7.0, and n= 90

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