This general form can be used to evaluate any type of scientific study, article, or news story. Students are requied to identify the study's purpose, authors, potential bias, propose potential errors or shortcomings, how it relates to their life, and more.
I use this as a weekly journal entry for science in the news, using TV news stories, newspaper and magazine articles, and even professional journals. This could be scaled up or down depending on your students' ability.
Scientific literacy entails being able to read with understanding articles about science in the popular press and to engage in social conversation about the validity of the conclusions. Scientific literacy implies that a person can identify scientific issues underlying national and local decisions and express positions that are scientifically and technologically informed. A literate citizen should be able to evaluate the quality of scientific information on the basis of its source and the methods used to generate it. Scientific literacy also implies the capacity to pose and evaluate arguments based on evidence and to apply conclusions from such arguments appropriately. (National Science Education Standards, page 22)