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Write the independent and dependent variables for the following research projects: a) Sociologists often look at the relationship between depression and doing exercise, and they expect that more exercises lead to lower levels of depression. b) Many policy experts examine educational attainment has an effect on people's attitudes towards science. c) A research team plans to explore children's academic achievements are inuenced by their sleep time. d) A researcher wants to study whether people's political views affect their attitudes to same sex relationship