A researcher is interested in determining if there is an association between birth order and self-esteem. She collects data from participants who were either born first, second, or third in relation to their siblings. These participants complete a self-esteem questionnaire, and the researcher categorizes them as having high or low self-esteem based on the results. She then decides to test the association between these two variables. Using the collected (observed) data in the chart, what are the df for this study? Observed Data