Do a survey to find the average age of cars parked on your college campus. (A letter or digit denoting the registration year can be found on the number plate – precise details can be obtained in various guides to used-car prices.) You might need stratified sampling (e.g. if administrators have newer cars than faculty and students, for example). You could extend the analysis by comparing the results with a public car park. You should write a brief report outlining your survey methods and the results you obtain. If several students do such a survey you could compare results.