Which of these is a manifestation of null hypothesis? a. As temperature increases so too will the level of aggressionb. Older adults will have worse memories than younger adultsc. There will be no...

Which of these is a manifestation of null hypothesis? a. As temperature increases so too will the level of aggression b. Older adults will have worse memories than younger adults c. There will be no relationship between caffeine consumption and performance d. There will be a significant difference between group 1 and group 2