For students who first enrolled in twoyear public institutions in fall 2007, the proportion who earned a bachelor's degree within six years was 0.399. The president of Joliet Junior College believes that the proportion of students who enroll in her institution have a higher completion rate.

Determine the null and alternative hypotheses, (b) explain what it would mean to make a Type I

error, and (c) explain what it would mean to make a Type II error.