(b): A taxi company is trying to decide whether the use of radial tires instead of regular belted tires improves fuel economy. Twelve cars were equipped with radial tires and driven over a prescribed test course. Without changing drivers, the same cars were then equipped with regular belted tires and driven once again over the test course. At 0.025 level, can we conclude that cars equipped with radial tires give better fuel economy than those equipped with belted tires. Assume the populations to be normally distributed. The gasoline consumption, in kilometers per liter, was recorded as follows: Kilometers per liter No. of cars Radial tires Belted tires 1 4.2 4.1 4.7 4.9 3 6.6 6.2 4 7.0 6.9 6.7 6.8 4.5 4.4 7 5.7 5.7 8 6.0 5.8 7.4 6.9 10 4.9 4.7 11 6.1 6.0 12 5.2 4.9

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(b): A taxi company is trying to decide whether the use of radial tires instead of
regular belted tires improves fuel economy. Twelve cars were equipped with radial
tires and driven over a prescribed test course. Without changing drivers, the same
cars were then equipped with regular belted tires and driven once again over the
test course. At 0.025 level, can we conclude that cars equipped with radial tires give
better fuel economy than those equipped with belted tires. Assume the
populations to be normally distributed.
The gasoline consumption, in kilometers per liter, was recorded as follows:
Kilometers per liter
No. of cars
Radial tires
Belted tires
1
4.2
4.1
2
4.7
4.9
3
6.6
6.2
4
7.0
6.9
5
6.7
6.8
4.5
4.4
7
5.7
5.7
8
6.0
5.8
7.4
6.9
10
4.9
4.7
11
6.1
6.0
12
5.2
4.9
Transcribed Image Text:(b): A taxi company is trying to decide whether the use of radial tires instead of regular belted tires improves fuel economy. Twelve cars were equipped with radial tires and driven over a prescribed test course. Without changing drivers, the same cars were then equipped with regular belted tires and driven once again over the test course. At 0.025 level, can we conclude that cars equipped with radial tires give better fuel economy than those equipped with belted tires. Assume the populations to be normally distributed. The gasoline consumption, in kilometers per liter, was recorded as follows: Kilometers per liter No. of cars Radial tires Belted tires 1 4.2 4.1 2 4.7 4.9 3 6.6 6.2 4 7.0 6.9 5 6.7 6.8 4.5 4.4 7 5.7 5.7 8 6.0 5.8 7.4 6.9 10 4.9 4.7 11 6.1 6.0 12 5.2 4.9
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