In Problem 13.4 on page 493, you used the percentage of alcohol to predict wine quality. The data are stored in VinhoVerde. For these data, S Y X = 0.9369 and h i = 0.024934 X = 10. a. Construct a 95 % confidence interval estimate of the mean wine quality rating for all wings that have 10 % alcohol. b. Construct a 95 % prediction interval of the wine quality rating of an individual wine that has 10 % alcohol. c. Explain the difference in the result in (a) and (b),
In Problem 13.4 on page 493, you used the percentage of alcohol to predict wine quality. The data are stored in VinhoVerde. For these data, S Y X = 0.9369 and h i = 0.024934 X = 10. a. Construct a 95 % confidence interval estimate of the mean wine quality rating for all wings that have 10 % alcohol. b. Construct a 95 % prediction interval of the wine quality rating of an individual wine that has 10 % alcohol. c. Explain the difference in the result in (a) and (b),
In Problem 13.4 on page 493, you used the percentage of alcohol to predict wine quality. The data are stored in VinhoVerde. For these data,
S
Y
X
=
0.9369
and
h
i
=
0.024934
X
=
10.
a. Construct a
95
%
confidence interval estimate of the mean wine quality rating for all wings that have
10
%
alcohol.
b. Construct a
95
%
prediction interval of the wine quality rating of an individual wine that has
10
%
alcohol.
c. Explain the difference in the result in (a) and (b),
Definition Definition Method in statistics by which an observation’s uncertainty can be quantified. The main use of interval estimating is for describing a range that is made by transforming a point estimate by determining the range of values, or interval within which the population parameter is likely to fall. This range helps in measuring its precision.
You are planning an experiment to determine the effect of the brand of gasoline and the weight of a car on gas mileage measured in miles per gallon. You will use a single test car, adding weights so that its total weight is 3000, 3500, or 4000 pounds. The car will drive on a test track at each weight using each of Amoco, Marathon, and Speedway gasoline. Which is the best way to organize the study?
Start with 3000 pounds and Amoco and run the car on the test track. Then do 3500 and 4000 pounds. Change to Marathon and go through the three weights in order. Then change to Speedway and do the three weights in order once more.
Start with 3000 pounds and Amoco and run the car on the test track. Then change to Marathon and then to Speedway without changing the weight. Then add weights to get 3500 pounds and go through the three gasolines in the same order.Then change to 4000 pounds and do the three gasolines in order again.
Choose a gasoline at random, and run the car with this gasoline at…
AP1.2 A child is 40 inches tall, which places her at the 90th percentile of all children of similar age. The heights for children of this age form an approximately Normal distribution with a mean of 38 inches. Based on this information, what is the standard deviation of the heights of all children of this age?
0.20 inches (c) 0.65 inches (e) 1.56 inches
0.31 inches (d) 1.21 inches
AP1.1 You look at real estate ads for houses in Sarasota, Florida. Many houses range from $200,000 to $400,000 in price. The few houses on the water, however, have prices up to $15 million. Which of the following statements best describes the distribution of home prices in Sarasota?
The distribution is most likely skewed to the left, and the mean is greater than the median.
The distribution is most likely skewed to the left, and the mean is less than the median.
The distribution is roughly symmetric with a few high outliers, and the mean is approximately equal to the median.
The distribution is most likely skewed to the right, and the mean is greater than the median.
The distribution is most likely skewed to the right, and the mean is less than the median.
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