What Type of Threat? Match the letter of the appropriate research methodology from Column E with its topic in Column A Comm ape m... 1. The scorers of an examination a. Subject characteristics unconsciously grade the exam papers in such a way that some students . History receive lower scores than they deserve. . Maturation 2. The taking of a pretest by students participating in a research study allows . Attitude of subjects them to gure out the nature of this study. . Mortality 3. Two existing groups are compared . Data collector bias with respect to their scores on an achievement test. g. Testing . A re drill occurs during the taking of h. Instrument decay a nal examination. Several students complain they did not have enough time to complete the exam. . Change during an intervention is due to just the passing of time rather than the intervention itself. a. The way in which students are as=k to participate in a study affects how they perform