The recommendations of respected wine critics have a substantial effect on the price of wine. Vintages that earn 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 (d). Click the icon to view the table of wine rating, price, and vintage. (a) Do the ratings meet the conditions needed for a two-sample confidence interval? A. Yes, all the conditions are satisfied. OB. No, the 2000 data contains outliers. OC. No, the 2001 data is too skewed. OD. No, the sampling procedure was not identified and it cannot be concluded that this is a simple random survey. OE. No, the variances are drastically different. (b) Find the 95% confidence interval for the difference in average ratings in these two vintages. Does one of the years look better than the other? The 95% confidence interval for #2000-2001 is (-0.4 1.8). (Round to one decimal place as needed.) Wine rating, price and vintage table. Rating 92 94 91 90 91 94 93 91 87 91 88 93 89 Price Vintage 130 2000 30 2000 45 2001 9 2000 33 2001 117 2000 125 2001 19 2001 17 2000 33 2000 15 2001 36 2000 85 2001 Rating 93 90 91 90 94 92 90 92 90 91 93 92 91 Price Vintage 72 2000 23 2001 40 2000 45 2000 50 2000 50 2000 29 2001 40 2000 42 2001 50 2001 50 2001 80 2000 23 2001 Full data set
The recommendations of respected wine critics have a substantial effect on the price of wine. Vintages that earn 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 (d). Click the icon to view the table of wine rating, price, and vintage. (a) Do the ratings meet the conditions needed for a two-sample confidence interval? A. Yes, all the conditions are satisfied. OB. No, the 2000 data contains outliers. OC. No, the 2001 data is too skewed. OD. No, the sampling procedure was not identified and it cannot be concluded that this is a simple random survey. OE. No, the variances are drastically different. (b) Find the 95% confidence interval for the difference in average ratings in these two vintages. Does one of the years look better than the other? The 95% confidence interval for #2000-2001 is (-0.4 1.8). (Round to one decimal place as needed.) Wine rating, price and vintage table. Rating 92 94 91 90 91 94 93 91 87 91 88 93 89 Price Vintage 130 2000 30 2000 45 2001 9 2000 33 2001 117 2000 125 2001 19 2001 17 2000 33 2000 15 2001 36 2000 85 2001 Rating 93 90 91 90 94 92 90 92 90 91 93 92 91 Price Vintage 72 2000 23 2001 40 2000 45 2000 50 2000 50 2000 29 2001 40 2000 42 2001 50 2001 50 2001 80 2000 23 2001 Full data set
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:The recommendations of respected wine critics have a substantial effect on the price of wine. Vintages that earn 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 (d).
Click the icon to view the table of wine rating, price, and vintage.
(a) Do the ratings meet the conditions needed for a two-sample confidence interval?
A. Yes, all the conditions are satisfied.
B. No, the 2000 data contains outliers.
OC. No, the 2001 data is too skewed.
D. No, the sampling procedure was not identified and it cannot be concluded that this is a simple random survey.
E. No, the variances are drastically different.
(b) Find the 95% confidence interval for the difference in average ratings in these two vintages. Does one of the years look better than the other?
The 95% confidence interval for 2000-2001 is (-0.4, 1.8
(Round to one decimal place as needed.)
Wine rating, price and vintage table.
Rating
92
94
91
90
91
94
93
91
87
91
88
93
89
Price Vintage
130 2000
30 2000
45
2001
9 2000
33 2001
117 2000
125 2001
19 2001
17 2000
33 2000
15 2001
2000
2001
36
85
Rating
93
90
91
90
94
92
90
92
90
91
93
92
91
Price Vintage
72 2000
23 2001
40 2000
45 2000
50 2000
50 2000
29 2001
40 2000
42 2001
50 2001
50 2001
80 2000
23
2001
Full data set
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