Suppose that you want to estimate the proportion of vehicles on the road in your hometown that are sport utility vehicles (SUVs). You decide to stand at the intersection closest to your home between 7 and 8 A. M. every morning for a week, keeping track of how many vehicles go by and how many of them are SUVs. (a) Identify the population, sample, parameter, and statistic (all in words) in this study. (b) Give some reasons why your sampling method is probably not unbiased.