Mann-Whitneyy Test and CI : Nike's expense, Competitor's expense
		N	Median
Nike's expense	80	8.1293
Copetitor's expense	70	6.8179
point estimate for ETA1-ETA2 is 1.2480
95.0 percent CI for ETA1-ETA2 is (1.0497, 1.4191)
W = 8480.0
Test of ETA1 = ETA1 not = ETA2 is significant at 0.0000

a. give an explanation whether there is a tendency for differences in monthly spending between Nike and competitors?

b. Using the real level of 5%, what can be inferred from the analysis?