Clifford Adelman, a researcher with the Department of Education, followed a group of students who graduated from high school in 1992. He monitored the progress the students made toward completing a bachelor's degree. One aspect of his research was to determine whether students who first attended community college took longer to attain a bachelor's degree than those who immediately attended and remained at a 4-year institution.

Community College

4 year institution

Sample size

268

1,145

Mean time to graduate (in years)

5.43

4.43

Standard deviation time to graduate (in years)

1.162

1.015

Does the evidence suggest that community college transfer students take longer to attain a bachelor's degree? Use significance level of 0.01.