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.