l. The Division of Traffic and Parking at a large university wants to know the percentage of students who used the campus bus system last week. The}; take a random sample of 400 students from their list of students with parking stickers and find that 20% of them have used the bus system during the past week. The results of this survey are reported as follows: \"With 95% confidence, the percentage of students using the bus system lies in the range 20% :r 4%.\" a) Identify each of the following: Intended population Sampling frame Sample Statistic Parameter Margin of error