LESSON 8. | THE IDEA OF A CONFIDENCE INTERVAL Lesson App 8. I Have you ever traveled internationally? A recent survey asked a random sample of U.S. adults if they had ever traveled internationally. Based on the sample, the 95% confidence interval for the true proportion of U.S. adults who have traveled internationally is 0.436 to 0.478. 1. Interpret the confidence interval. 2. Calculate the point estimate and margin of error used to create this confidence interval. 3. Is it plausible that a majority of U.S. adults have traveled internationally? Explain your reasoning. LESSON 8.2 WHAT AFFECTS THE MARGIN OF ERROR? Lesson App 8.2 Did you keep your New Year's resolution? At the end of 2019, Morning Consult surveyed a random sample of U.S. adults about New Year's Resolutions. Among the 655 people in the sample who made a resolution, 402 said they had kept their resolution. The 95% confidence interval for the proportion of all resolution-making U.S. adults who kept their resolution is 0.576 to 0.651 1. Interpret the confidence