Question

The recommendations of respected wine critics have a substantial effect on the price of wine. Vintages that en higher ratings command higher prices and spark surges in demand. These data are a random sample of ratings of wines selected from an online web site from the 2000 and 2001 vintages. Complete parts (a) through Click the icon to view the table of wine rating price, and vintage A Yes, the conditions are satistiea. OB. No, the 2000 data contains outliers. O C. No, the 2001 data is too skewed. D. No, the sampling procedure was not identified and it cannot be O E No, the variances are drastically different. osts survey one of the years look better than the other? (b) Find the 95% confidence interval for the difference in average ratings in these two vintages. D . ady for The 95% confidence interval for P2000 - 2001 is ( L (Round to one decimal place as needed.)

Answer 1

Solution from the given date, fo aooo, n = 1, 1, 1-5 3 : 22-7 for 2001, ño = 62 , 7x=91-25, 5 -2.56 S = 1.60 x-12 = 72-5-91-25 =-18-75 - 16-3525 n, +2₂-2 Sp - ) cm-Ds?+602-15 316-3525 se - Json G, * +-) - Jels) 6 + SE - 6-4320 df = 9, 2 = 2 = 14+12 -2 = 24 At 95% confidence, for 24 =df, ta/2 =2-064 The 95.5. Confidence intervals are 67, -7) ++42*5€ = -18.45 .2-014 (64320) - (-22-025 6,-5-4743) ... The 95% confidence interval for - M2ooo - 42000 is =(- 32.0,- 5.4) CS CamScanner cs Scanned with