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(a) Do the ratings meet the conditions needed for a two-sample confidence interval?

(a) Do the ratings meet the conditions needed for a two-sample confidence interval?

MATLAB: An Introduction with Applications
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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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. C. 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. O 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? -0.59,2.11). The 95% confidence interval for 2000 - 2001 is (Round to one decimal place as needed.)
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. C. 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. O 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? -0.59,2.11). The 95% confidence interval for 2000 - 2001 is (Round to one decimal place as needed.)
Wine rating, price and vintage table. Rating 92 92 90 89 91 92 94 91 90 92 90 93 90 Price Vintage Rating 94 91 130 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 92 91 94 93 90 89 91 91 91 91 92 Price Vintage 72 2000 23 2001 40 2000 45 2000 50 2000 2000 2001 40 2000 42 2001 50 2001 50 29 50 2001 80 2000 23 2001 Full data set - X
Transcribed Image Text:Wine rating, price and vintage table. Rating 92 92 90 89 91 92 94 91 90 92 90 93 90 Price Vintage Rating 94 91 130 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 92 91 94 93 90 89 91 91 91 91 92 Price Vintage 72 2000 23 2001 40 2000 45 2000 50 2000 2000 2001 40 2000 42 2001 50 2001 50 29 50 2001 80 2000 23 2001 Full data set - X
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