1. Finding a Point Estimate for p In a survey of 1000 U.S. teens, 372 said that they own smartphones. Find a point estimate for the population proportion of U.S. teens who own smartphones. 2. In a...

1. Finding a Point Estimate for p In a survey of 1000 U.S. teens, 372 said that they own smartphones. Find a point estimate for the population proportion of U.S. teens who own smartphones.

2. In a survey of 2462 U.S. teachers, 123 said that “all or almost all” of the information they find using search engines online is accurate or trustworthy. (Pew Research Center)

a. Identify x and n.

b. Use x and n to find np.

3. Constructing a Confidence Interval for p Use the data in Example 1 to construct a 95% confidence interval for the population proportion of U.S. teens who own smartphones.