Finally, use the Th eory-Based Inference applet to find a 95% confidence interval for the population proportion of drivers 16 to 17 who have ever talked on a cell phone while driving.
a. What is the interval?
b. How does this interval compare to the ones you found in Questions 18 and 19a? Why would you expect that?

Let’s use our 3S strategy to help us investigate how much evidence the sample data provide to support our conjecture that a majority of 16- to 17-year olds have talked on their cell phone while driving.