1.28 To what does the term internal validity refer? a) the degree to which results of a study can be generalized from one sample to another b) the process of subject selection c) the development of a treatment d) the degree to which the results of a study can be attributed to the manipulation of the independent variable 1.29 A research abstract contains which of the following? a) a summary of a journal article b) a list of sources from an online index c) a complicated idea d) a type of painting 1.30 In a research proposal, which section comes first? a) introduction b) literature review c) implications and limitations d) method