[U6Q] Martin is analyzing data to determine the success of a…
Martin is analyzing data to determine the success of an intervention. He reviews his research question, determines if there are sufficient data in each condition, and looks for variables that may have affected the data both within and across conditions. During his analysis, he sees that two of his research assistants are inputting graphical data at different scales, rendering visual analysis of the data impossible. What step in performing a visual analysis should Martin have taken before reviewing his research question?