Don conducted a survey of two groups left parenthesis n subscript 1 equals 50 comma space n subscript 2 space end subscript equals 50 right parenthesis of students that recently graduated from private and public colleges. He found that the mean debt for the students who attended private college was $26,600, while those who attended public colleges had a mean debt of $24,400. Don wants to see if the difference in mean debt is statistically significant. What should Don state for the null hypothesis?