?Elapsed Time to Earn a Bachelor’s Degree A researcher with the Department of Education followed a cohort of students who graduated from high school in

Chapter 11, Problem 7

(choose chapter or problem)

Elapsed Time to Earn a Bachelor’s Degree A researcher with the Department of Education followed a cohort of students who graduated from high school in 1992, monitoring 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. The data in the table summarize the results of his study.

(a) What is the response variable in this study? What is the explanatory variable?

(b) Explain why this study can be analyzed using the methods of this section.

(c) Does the evidence suggest that community college transfer students take longer to attain a bachelor’s degree? Use an  = 0.01 level of significance.

(d) Construct a 95% confidence interval for mcommunity college - mno transfer to approximate the mean additional time it takes to complete a bachelor’s degree if you begin in community college.

(e) Do the results of parts (c) and (d) imply that community college causes you to take extra time to earn a bachelor’s degree? Cite some reasons that you think might contribute to the extra time to graduate.