Final answer:
The question is about a study on the relationship between SAT scores and state-level characteristics. Linear regression was used to estimate this relationship and the coefficient of determination was calculated.
Step-by-step explanation:
The subject of this question is Mathematics. The question asks about a recent study on the relationship between SAT scores and U.S. state-level characteristics.
In this study, linear regression was used to estimate the relationship between average SAT scores and the percent of high school seniors who took the SAT within a state.
The coefficient of determination, also known as the R-squared value, was calculated to determine how well the linear regression model explains the variation in average SAT scores.