Variable Definitions

Rewrite each of the following statements in the form of a testable hypothesis. Note: please stick to the original meaning of the sentence. Don't add any extra information/variables to your hypothesis.
For each hypothesis identify: (a) the independent variable; (b) the dependent variable; and where included, (c) the control variable (not all sentences have a control variable).
(1) Ignorance breeds prejudice.
(2) Owning a gun places people in great danger.
(3) Among the elderly, there is a relationship between marital status and happiness.
(4) Highly educated people are politically liberal.
(5) Frequent dating lowers the grades of females.
(6) Study time is related to grades among seniors only.
(7) Close supervision increases the absenteeism of white-collar workers.
(8) Students who attend class regularly generally do better.