A Regression Equation Is Obtained for the Following Set of Data

Essay

A regression equation is obtained for the following set of data. $\begin{array} { r | r r r r r r } \mathrm { x } & 2 & 4 & 6 & 9 & 10 & 12 \\ \hline \mathrm { y } & 28 & 33 & 39 & 45 & 47 & 52 \end{array}$
For what range of x-values would it be reasonable to use the regression equation to predict the y-value corresponding to a given x-value? Why?