State the type of sample 1 A radio station asks to listeners to call in and give their opinion on the song just played 2 A Student selected books from each of the categories of Science fiction and history The number of pages in each book was identified 3 During the last presidential election CNN Conducted an exit poll at randomly Selected Polling station and all voters Were Surveyed as they left the premises when collecting data in a lake a researcher Stretches a rope across the lake and Collects Samples atevery interal of 5 meters To Testa New drug Subects were Trondmly selected to take part in