Previous literature leaves us unanswered questions about whether teaching behaviors mediate the relationship between teacher education level and experience with student science achievement. This study examined this question with 655 students from sixth to eighth grade and their 12 science teachers. Student science achievements were measured at the beginning and end of 2006-2007 school year. Given the cluster sampling of students nested in classrooms, which are nested in teachers, a two-level multilevel model was employed to disentangle the effects from teacher-level and student-level factors. Several findings were discovered in this study. Science teachers possessing of advanced degrees in science or education significantly and positively influenced student science achievement. However, years of teaching experience in science did not directly influence student science achievement. A significant interaction was detected between teachers possessing an advanced degree in science or education and years of teaching science, which was inversely associated to student science achievement. Better teaching behaviors were also positively related to student achievement in science directly, as well as mediated the relationship between student science achievement and both teacher education and experience. Additionally, when examined separately, each teaching behavior variable (teacher engagement, classroom management, and teaching strategies) served as a significant intermediary between both teacher education and experience and student science achievement. The findings of this study are intended to provide insights into the importance of hiring and developing qualified teachers who are better able to help students achieve in science, as well as to direct the emphases of ongoing teacher inservice training.

This study addressed the problem of insufficient information concerning the impact of variability in requirements and credentials for Florida Voluntary Prekindergarten (VPK) teachers statewide on VPK program quality. This study examined the variance in the professional credentials of VPK lead instructors in Florida school districts and whether or not this variability makes a significant difference in program quality as measured by VPK Provider Kindergarten Readiness Rates. Analysis of variance (ANOVA) and analysis of covariance (ANCOVA) statistical tests were conducted, as appropriate, for each of four research questions. Research findings indicated there was no statistically significant difference in the mean VPK Provider Kindergarten Readiness Rates based on the professional credentials for VPK lead instructors when controlling for the socio-economic status of the children enrolled at each site. Recommendations were made for future research to replicate the study using a different indicator of program quality, perhaps a measure of student progress throughout the school year. Also, the first groups of students to participate in Florida’s voluntary prekindergarten (VPK) program are now enrolled in upper elementary grades making a longitudinal study both feasible and worthwhile in evaluating the effectiveness of a largescale preschool program. The researcher further recommended that the idea of improving the qualifications of the prekindergarten workforce must persist, supported by continued research and adequate funding.