Are urban students more successful? north carolina state university looked at the factors that affect the success of students in a required chemical engineering course. students must get a c or better in the course in order to continue as chemical engineering majors, so a "success" is a grade of c or better. there were 64 students from urban or suburban backgrounds, and 52 of these students succeeded. another 55 students were from rural or small-town backgrounds; 30 or these students succeeded in the course. is there good evidence that the proportion of students who succeed is different for urban/suburban versus rural/small-town backgrounds? how large is the difference? use a 90% confidence.