In Example 3.17 on page 186, we learn that, in a random sample of over 450,000 US adults, the proportion of people who say they exercised at some point in the last 30 days is p̂ = 0.726 with a standard error of SE = 0.0007. Find and interpret a 95% confidence interval for the proportion of US adults who have exercised in the last 30 days.