Stratify all the golf courses in the South Shore, put them in categories of Public Courses, Private Course, and Semi-Private Courses. Assign each of these courses a random number from 00 to however many courses there are of each type, lets say 20. Take ten types of courses from each strata and figure out what time their course opens at. For example, in the private courses category, order them in alphabetical order, assign them a number, then choose a random 10 courses and have them answer to see when they open. First couple random numbers of the Private Course Strata is 12, 7, 11, 19, 4, 6 and continued on. If a duplicate occurs, skip that number and find the next available number in the survey sample.