The data set in DS 11.1.3 concerns the infrared radiation readings from an energy source measured by

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The data set in DS 11.1.3 concerns the infrared radiation readings from an energy source measured by a particular meter with three different background radiation levels.
(a) Use the Kruskal-Wallis test procedure to investigate whether the radiation readings are affected by the background radiation level.
(b) Repeat the analysis using an analysis of variance table.
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