Chapter 25th ed pot: apped resear search results for all studies have so a variable is a factor that can be meta-analysis of existing data question 7 0.5 pts research questions are often broad and need to be transformed into specific problem statements that are amenable to investigation research questions may generally be categorized into three basic types of questions: descriptive relationship, and difference descriptive, experimental, and qualitative comparative, causal, and correlational past, present, and future declarative, discriminative, and empirical question 8 0.5 pts the "statement of the purpose in a research proposal is intended to: