A group of 350 sociology students answer a survey about whether they prefer studying at home or studying in the library. 210 students state that they prefer studying at home and 140 students state that they prefer studying in the library. Which of the following shows these findings (home to library) expressed as a ratio in its simplest form?
3:23 : 23:2
5:35 : 35:3
21:1421 : 1421:14
7:47 : 47:4
513 exam-style questions on OCR A Level Psychology Data recording, analysis and presentation. Each one has a worked solution and a mark scheme showing where the marks go.