A Member of the State Legislature Has Expressed Concern About $\beta$

A member of the state legislature has expressed concern about the differences in the mathematics test scores of high school freshmen across the state.She asks her research assistant to conduct a study to investigate what factors could account for the differences.The research assistant looked at a random sample of school districts across the state and used the factors of percentage of mathematics teachers in each district with a degree in mathematics,the average age of mathematics teachers and the average salary of mathematics teachers
s = 7.62090
Analysis of Variance
Determine the 90% interval for $\beta$ ₂ and interpret its meaning