I am working on an assignment for school. This is all my work. Does my math add up?

For an accurate result, 12 male participants and 12 female participants were needed. In this research study, we used stratified sampling and convenience sampling to evaluate the participants. The participants were recruited after completing a survey. Then, they were randomly selected. Participants were asked to participate in a study for an experimental psychology class. If the participant refused, then he or she was thanked and not bothered further. If the participant agreed, then he or she was required to sign an informed consent. If the participant was reluctant, then they were excluded from the research study. It is predicted that 25% of the males will be between the ages of 20 - 25, 25% of the males will be between the ages of 25 - 30, 65% of the males will be Caucasian, 30% of the males will be African American, and 5% of the males will be Hispanic. It is predicted that 25% of the females will be between the ages of 20 - 25, 25% of the females will be between the ages of 25 - 30, 55% of the females will beCaucasian, 30% of the females will be African American, and 15% of the females will be Hispanic.