d]; . Smart phone: Among 242 cell phone owners aged 18-24 surveyed, 107 said their phone was an Android phone. :7, (a) Find a point estimate for the proportion of cell phone 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 cell phone owners aged 18-24 who have an Android phone is . (b) Construct a 95% condence interval for the proportion of cell phone owners aged 18-24 who have an Android phone. Round the answers to at least three decimal places. A 95% condence interval for the proportion of cell phone owners aged 18-24 who have an Android phone is 0.379