Pew Research Reports That 63% of the U $\pm 7.5 \%$

Essay

Pew Research reports that 63% of the U.S. adult cell phone owners use their phone to go online. A company wants to target
16- to 24-year olds for advertising and they wonder if that age group has a similar pattern of phone use.
-The company wants to estimate the true percentage of 16- to 24-year old cell phone
owners who use their phone to go online to within $\pm 7.5 \%$
with 95% confidence. How
many cell phone owners in this age group should they sample?