The production of a certain organic chemical requires the addition of ammonium chloride. The manufacturer can conveniently obtain the ammonium chloride in any one of three forms€”powdered, moderately ground, and coarse. To see what effect, if any, the quality of the NH4Cl has, the manufacturer decides to run the reaction seven times with each form of ammonium chloride. The resulting yields (in pounds) are listed in the following table. Compare the yields with a Kruskal-Wallis test. Let α = 0.05.

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Organic Chemical Yields (lb) Moderately Powdered NHC Groud NH4CI Coarse NH4CI 146 152 149 161 158 149 154 150 144 148 155 154 150 148 141 138 142 146 139 145 137