In 2010, CSU Stanislaus accepted just 37% of applicants. Nevertheless, the admissions bar isn't that high, and students with decent grades and test scores are likely to get accepted. In the scattergram above, the green and blue dots represent students who got in. As you can see, most students who were accepted had grades in the "B" range or higher, SAT scores (CR+M+W) of 1300 or higher, and ACT scores of 17 or higher. However, note that there are a few red and yellow dots (rejected and waitlisted students) scattered throughout the graph. Some students with grades and test scores that seem to be on target for CSU Stanislaus did not receive an acceptance letter.
Unlike the University of California System, the California State University System admission process is not holistic. Except for EOP students, applicants do not need to submit letters of recommendation or an application essay, and extracurricular involvement is not part of the standard application. Thus, the reason why an applicant with adequate scores and grades would be rejected tends to come down to a couple factors such as insufficient college preparatory classes or an incomplete application.
To learn more about CSU Stanislaus, high school GPAs, SAT scores and ACT scores, these articles can help: