Which of the following statements is not a hypothesis? Aggressive behaviors in female rats will be increased by testosterone administration, compared to a control group. Anxiety disorders are caused by a combination of genetic and environmental influences. College students with higher conscientiousness will achieve higher overall GPAs than those with lower conscientiousness. Rats with damage to their cerebellum will display deficits in motor coordination, using the rotarod test.

Anxiety disorders are caused by a combination of genetic and environmental influences.

Explanation:

For the statement to qualify as a hypothesis, it has to offer an explanation of the phenomenon under investigation, which can be tested and measured.

The statement 'Anxiety disorders are caused by a combination of genetic and environmental influences' merely states the presumed causality between Anxiety disorders (dependent variable) and combination of genetic and environmental influences' (two different independent variables). If we reformulate this statement and narrow it down, it may qualify as hypothesis: individuals who live in areas with high air pollution, will be more likely to develop an anxiety disorder.