A researcher is investigating the effect of sleep duration on cognitive performance. Which of the following is a null hypothesis for this study?
'There will be no significant difference in cognitive performance test scores between participants who sleep for under 666 hours and those who sleep for over 888 hours.'
'Participants who sleep for under 666 hours will score significantly lower on a cognitive performance test than participants who sleep for over 888 hours.'
'There will be a significant difference in cognitive performance test scores between participants who sleep for under 666 hours and those who sleep for over 888 hours.'
'There will be a significant negative correlation between the number of hours of sleep and cognitive performance test scores.'
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.