Let F =MSTr/MSE Be the Test Statistic in a Single-Factor $H _ { o }$

Let F =MSTr/MSE be the test statistic in a single-factor ANOVA problem involving four populations or treatments with a random sample of six observations from each one. When $H _ { o }$ is true and the four population or treatment distributions are all normal with the same variance $\sigma ^ { 2 }$ then F has an F distribution with degrees of freedom $v _ { 1 } =$$\underline{\quad\quad}$ and $v _ { 2 } =$$\underline{\quad\quad}$ With f denoting the computed value of F, the rejection region for level .05 test is __________.