<p>In an ongoing effort to increase
student retention and success in the undergraduate general chemistry course
sequence, a fully online preparatory chemistry course was developed and
implemented at a large public research university. To gain insight about the
efficacy of the online course, post-hoc analyses were carried out in which
student performance on final exams, and performance in the subsequent general
chemistry course were compared between the online cohort and a previous student
cohort who completed the preparatory chemistry course in a traditional lecture format.
Because the retention of less academically prepared students in STEM majors is
a historical problem at the institution in which the online preparatory
chemistry course was implemented, post-hoc analyses were also carried out to
determine if this at-risk group demonstrated similar achievement relative to
the population at large. Multiple linear regression analyses were used
to compare final exam scores and general chemistry course grades between the
online and in-person student cohorts, while statistically controlling for
incoming student academic achievement. Results from these analyses suggest the
fully online course led to increased final exam scores in the preparatory
course (unstandardized <i>B</i> = 8.648, <i>p</i> < 0.001) and higher grades
in the subsequent general chemistry course (unstandardized <i>B</i> = 0.269, <i>p</i>
< 0.001). Notably, students from the lowest
quartile of incoming academic preparation appear to have been more positively
impacted by the online course experience (preparatory chemistry final exam
scores: unstandardized <i>B</i> = 11.103, <i>p</i> < 0.001; general chemistry
course grades: unstandardized <i>B</i> = 0.323, <i>p</i> = 0.002). These
results suggest a fully online course can help improve student preparation for
large populations of students, without resulting in a negative achievement gap
for less academically prepared students. The structure and implementation of
the online course, and the results from the post-hoc analyses will be described
herein. </p>