Independent and Dependent Variables
For the following hypotheses, state whether the hypothesis is one
or two-tailed and state the independent and dependent variable.
1. There will be a significant difference in the speed with which
people react to visual and auditory stimuli.
Direction:____________________________________________
IV:_________________________________________________
DV:________________________________________________
2. Drug ‘A’ will significantly impair participants’ ability to
correctly recall list of words.
Direction:____________________________________________
IV:_________________________________________________
DV:________________________________________________
3. Participants will run 500m significantly faster when they are
being watched by a group of 10 people than participants who
only have the experimenter present.
Direction:____________________________________________
IV:_________________________________________________
DV:________________________________________________

4. The eldest child in a family learnt to speak at a significant
earlier age than the second born sibling.
Direction:____________________________________________
IV:_________________________________________________
DV:________________________________________________
5. Men drive significantly faster around a 1 mile course than
females.
Direction:____________________________________________
IV:_________________________________________________
DV:________________________________________________
6. Lack of sleep significantly affects the ability of 10 year old
boys.
Direction:____________________________________________
IV:_________________________________________________
DV:________________________________________________
7. Social class significantly affects Intelligence Quotient (IQ)
scores.
Direction:____________________________________________
IV:_________________________________________________
DV:________________________________________________

8. Participants will recall significantly more words correctly, when
they are ‘chunked’ together when learnt than when they were
presented in an unconnected list.
Direction:____________________________________________
IV:_________________________________________________
DV:________________________________________________
9. Time of day will have a significant effect on the attention span
of AS Psychology students.
Direction:____________________________________________
IV:_________________________________________________
DV:________________________________________________
10. Alcohol will significantly decrease reaction time of
drivers in a driving simulator.
Direction:____________________________________________
IV:_________________________________________________
DV:________________________________________________
11.Teachers will have significantly more headaches during a term
than AS students.
Direction:____________________________________________
IV:_________________________________________________
DV:________________________________________________