A tire manufacturer is interested in testing the fuel economy for two different tread patterns. Tires of each tread type are driven for 1000 miles on each of 18 different cars. The mileages, in mpg, are presented in the following table. Car Tread A Tread B 24.1 20.3 22.3 19.7 24.5 22.5 26.1 23.2 22.6 20.4 23.3 23.5 22.4 21.9 8. 19.9 18.6 27.1 25.8 Car Tread A Tread B 10 23.5 21.4 11 25.4 20.6 12 24.9 23.4 13 23.7 20.3 14 23.9 22.5 15 24.6 23.5 16 26.4 24.5 17 21.5 22.4 18 24.6 24.9 Find a 99% confidence interval for the mean difference in fuel economy. A confidence interval based on the data in the table has width ±0.5 mpg. Is the level of this confidence interval closest to 80%, 90%, or 95%? a. Ь.
A tire manufacturer is interested in testing the fuel economy for two different tread patterns. Tires of each tread type are driven for 1000 miles on each of 18 different cars. The mileages, in mpg, are presented in the following table. Car Tread A Tread B 24.1 20.3 22.3 19.7 24.5 22.5 26.1 23.2 22.6 20.4 23.3 23.5 22.4 21.9 8. 19.9 18.6 27.1 25.8 Car Tread A Tread B 10 23.5 21.4 11 25.4 20.6 12 24.9 23.4 13 23.7 20.3 14 23.9 22.5 15 24.6 23.5 16 26.4 24.5 17 21.5 22.4 18 24.6 24.9 Find a 99% confidence interval for the mean difference in fuel economy. A confidence interval based on the data in the table has width ±0.5 mpg. Is the level of this confidence interval closest to 80%, 90%, or 95%? a. Ь.
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter7: Percents
Section: Chapter Questions
Problem 4CST
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Transcribed Image Text:A tire manufacturer is interested in testing the fuel economy for two different tread patterns.
Tires of each tread type are driven for 1000 miles on each of 18 different cars. The
mileages, in mpg, are presented in the following table.
Car
Tread A
Tread B
24.1
20.3
22.3
19.7
24.5
22.5
26.1
23.2
22.6
20.4
23.3
23.5
22.4
21.9
8.
19.9
18.6
27.1
25.8
Car
Tread A
Tread B
10
23.5
21.4
11
25.4
20.6
12
24.9
23.4
13
23.7
20.3
14
23.9
22.5
15
24.6
23.5
16
26.4
24.5
17
21.5
22.4
18
24.6
24.9
Find a 99% confidence interval for the mean difference in fuel economy.
A confidence interval based on the data in the table has width ±0.5 mpg. Is the level of
this confidence interval closest to 80%, 90%, or 95%?
a.
Ь.
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