Which of the following is a null hypothesis?
'Participants who consume caffeine will not have significantly faster reaction times than participants who consume decaffeinated drinks.'
'There will be a significant difference in reaction times between participants who consume caffeine and those who consume decaffeinated drinks.'
'There will be a significant negative relationship between the amount of caffeine consumed and reaction times.'
'There will be no significant difference in reaction times between participants who consume caffeine and those who consume decaffeinated drinks.'
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.