The accompanying data consists of prices ($) for one sample of California cabernet sauvignon wines that received ratings of 93 or higher in the May 2013 issue of Wine Spectator and another sample of California cabernets that received ratings of 89 or lower in the same issue.
≥ 93: | 100 | 100 | 60 | 135 | 195 | 195 | |
125 | 135 | 95 | 42 | 75 | 72 | ||
≤89: | 80 | 75 | 75 | 85 | 75 | 35 | 85 |
65 | 45 | 100 | 28 | 38 | 50 | 28 |
Assume that these are both random samples of prices from the population of all wines recently reviewed that received ratings of at least 93 and at most 89, respectively.
a. Investigate the plausibility of assuming that both sampled populations are normal.
b. Construct a comparative boxplot. What does it suggest about the difference in true average prices?
c. Calculate a confidence interval at the 95% confidence level to estimate the difference between µ1, the
Trending nowThis is a popular solution!
Chapter 9 Solutions
Probability and Statistics for Engineering and the Sciences
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw Hill