Smart phone: Among 247 cell phone owners aged 18-24 surveyed, 107 said their phone was an Android phone. Espanol Perform the following. Part 1 of 3 OO (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 0.4331 Part: 1 / 3 Part 2 of 3 (b) Construct a 99% confidence interval for the proportion of cell phone owners aged 18-24 who have an Android phone. Round the answer to at least three decimal places. A 99% confidence interval for the proportion of cell phone owners aged 18-24 who have an Android phone is