A ski company in Vail owns two ski shops, one on the west side and one on the east side of Vail. Ski hat sales data (in dollars) for a random sample of 5 Saturdays during the 2004 season showed the following results. Is there a significant difference in sales doliars of hats between the west side and east side stores at the 10 percent level of significance? Click here for the Excel Data File: (o) Choose the appropriate hypotheses. Assume d is the ditference in average sales between the east side and west side stores a. H0d=0 versus H1:d=0 b. H0d=0 versus H1d=0. a b (b) State the decision rufe for a 5 percent level of significance. (Round your answers to 3 decimal places.) Reject the null hypothesis if tcalc