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In a mobile phone shop on a Sunday morning, out of n = 77 customers x = 19 buy a mobile phone. What is the 95% confidence interval for the proportion of customers buying a mobile phone?
(1) [0.165, 0.326]
(2) [0.149, 0.342]
(3) [0.228, 0.252]
(4) [0.115, 0.376]
(5) [0.1485, 0.3586]
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When would you use hypothesis testing and when would you use confidence intervals?
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