The Accompanying Data Refers to Concentration of the Radioactive Isotope

Essay

The accompanying data refers to concentration of the radioactive isotope strontium-90 in milk samples obtained from five randomly selected dairies in each of four different regions. $$\begin{array} { c l | c c c c c } \hline & \mathbf { 1 } & 7.0 & 6.4 & 7.1 & 8.3 & 6.7 \\\hline \text { Region } & \mathbf { 2 } & 7.7 & 10.5 & 11.8 & 11.1 & 9.4 \\& \mathbf { 3 } & 6.3 & 6.5 & 8.8 & 7.2 & 5.7 \\& \mathbf { 4 } & 10.1 & 12.7 & 10.9 & 13.0 & 12.3 \\\hline\end{array}$$ Test at level .10 to see whether true average strontium-90 concentration differs for at least two of the regions.