A researcher wants to conduct a study on study habits using a sample of n=40n = 40n=40 students from a sixth form college. The college has 240 Year 12 students and 160 Year 13 students.
Which of the following procedures describes a correct method to obtain a proportional stratified sample?
Selecting every 10th student from an alphabetical register of all 400 students, beginning with a randomly chosen student between 1 and 10.
Selecting the first 24 Year 12 students and the first 16 Year 13 students who sign up on a volunteer sheet in the school hall.
Assigning a unique number to each student within their year group, then using a random number generator to select 20 Year 12 students and 20 Year 13 students.
Assigning a unique number to each student within their year group, then using a random number generator to select 24 Year 12 students and 16 Year 13 students.
201 exam-style questions on OCR A Level Psychology Planning and conducting research. Each one has a worked solution and a mark scheme showing where the marks go.