Estimating Theme Park Attendance Each year, billions of dollars are spent at theme parks owned by Disney, Universal Studios, Sea World, Busch Gardens, and others. A survey of 1233 people who took trips revealed that 111 of them included a visit to a theme park (based on data from the Travel Industry Association of America).

a. Find the point estimate of the percentage of people who visit a theme park when they take a trip.

b. Find a 95% confidence interval estimate of the percentage of all people who visit a theme park when they take a trip.

c. The survey was conducted among people who took trips, but no information was given about the percentage of people who take trips for pleasure. If you want to estimate the percentage of adults who take a pleasure trip in a year, how many people must you survey if you want to be 99% confident that your sample percentage is within 2.5 percentage points of the correct population percentage?