8.17 How did you use your cell phone? Refer to Exercise 8.14.

1. (a) Report the sample proportion, the standard error of the sample proportion, and the margin of error for 95% confidence.

2. (b) Are the guidelines for when to use the large-sample confidence interval for a population proportion satisfied in this setting? Explain your answer.

3. (c) Find the 95% large-sample confidence interval for the population proportion.

4. (d) Write a short statement explaining the meaning of your confidence interval.