Question: Three years ago, a major hotel chain purchased a large number of air-conditioning (AC) units from three manufacturers, A, B and C. The manager of the purchasing department randomly selected 6 brand A, 7 brand B, and 6 Brand C AC-units. The repair and replacement costs in dollars are summarized below. At the .05 significance level, is there a difference in repair costs among the three brands? Use both a nonparametric and parametric test. If the parametric tests rejects Ho then generate ALL MULTIPLE COMPARISONS at the 95% confidence level.

Brand A Brand B Brand C

150 430 330

220 370 540

200 420 650