A major university would like to improve its tarnished image following a large on-campus scandal. Its marketing department develops a short television commercial and tests it on a sample of n = 10, the first ten students who entered a housing commons area who agreed to participate. Attitudes about the university are measured with a short questionnaire, both before and after viewing the commercial. Attitudes were on a scale of 0 - 20, which higher numbers reflecting better attitudes. Use the provided data to examine whether the commercial improvedthe university's image.

Do you think it has more external or internal validity and why?