S tate the advantages and disadvantages of unobtrusive measures.
Answer each question succinctly. Describe a specific situation where your use of questionnaire is appropriate. Do the same for an interview, observation, and unobtrusive measure. For each of the following, indicate the type of evidence for validity that is being established. A researcher found a significant positive correlation between the teacher questionnaire measure of student cooperation and the observation measure of Student Supportive and Friendly Behavior.