The Following Data Are Drawn from Four Independent Samples Test at the 1% Significance Level to Determine Whether the

The following data are drawn from four independent samples: $\begin{array}{l}\text { Sample }\\\begin{array}{|c|c|c|c|}\hline \mathbf{1} & \mathbf{2} & \mathbf{3} & \mathbf{4} \\\hline 13 & 15 & 18 & 9 \\9 & 10 & 15 & 10 \\16 & 15 & 17 & 6 \\12 & 14 & 18 & 6 \\15 & & 13 & \\8 & & & \\\hline\end{array}\end{array}$ Test at the 1% significance level to determine whether the population medians differ.
H₀: __________________________
H₁: __________________________
Test statistic = ____________________
Critical Value = ____________________
Conclusion: _____________________________
Interpretation: ______________________________________________________