Study the following Minitab output. What is the purpose of this statistical test? What are the results of this analysis?

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Mann-Whitney Confidence Interval and Test Median = 37.000 Median = 46.500 Point estimate for ETA1 - ETA2 is -8.000. 95.2 Percent C.I. For ETA1 ETA2 is (-13.999, -2.997). W = 191.5 C₁ C₂ N = 16 N = 16 Test of ETA1 = ETA2 versus ETA1 ETA2 is significant at 0.0067. The test is significant at 0.0066 (adjusted for ties).