Smartphone: Among 251 smartphone owners aged 18 - 24 surveyed, 109 said their phone was an Android phone. Part 1 of 3 (a) Find a point estimate for the proportion of smartphone owners aged 18 - 24 who have an Android phone. Round the answer to at least three decimal places. The point estimate for the proportion of smartphone owners aged 18 - 24 who have an Android phone is 0.434 . Part: 1 / 3 1 of 3 Parts Complete Part 2 of 3 (b) Construct a 99.8% confidence interval for the proportion of smartphone owners aged 18 - 24 who have an Android phone. Round the answers to at least three decimal places. A 99.8% confidence interval for the proportion of smartphone owners aged 18 - 24 who have an Android phone is <

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