API vs. % FRPL
\[api = \beta_0 + \beta_1 pctfrpl + \varepsilon\]
\[SS_{residual} = 289019.7764047\]
\[api = \beta_0 + \beta_1 pctfrpl + \beta_2 pctblack + \varepsilon\]
\[SS_{residual} = 284768.955173\]
\[api = \beta_0 + \beta_1 pctfrpl + \beta_2 pctblack + \beta_3 pctasian + \varepsilon\]
\[SS_{residual} = 264314.4808346\]
\[api = \beta_0 + \beta_1 pctfrpl + \beta_2 pctblack + \beta_3 pctasian + \beta_4 pcthisp + \varepsilon\]
\[SS_{residual} = 253430.4785453\]