25. Suppose there is an experiment to compare fuel economics for two types of similarly equipped diesel mini-trucks. In this experiment, 15 Volkswagen and 10 Toyota trucks were used in a 90-kph test. If the Volkswagen trucks averaged 17 km/liter with s=1 km/liter and the Toyota units averaged 12 km/liter with s=0.8 km/liter. It is desired to know if it can be sufficiently said that Volkswagen trucks exceed similar Toyota counterparts by 4 km/liter at 5% significance level.

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter12: Angle Relationships And Transformations
Section12.7: Dilations
Problem 20E
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25. Suppose there is an experiment to compare fuel economics for two types of similarly equipped diesel mini-trucks. In this experiment, 15 Volkswagen and 10 Toyota trucks were used in a 90-kph test. If the Volkswagen trucks averaged 17 km/liter with s=1 km/liter and the Toyota units averaged 12 km/liter with s=0.8 km/liter. It is desired to know if it can be sufficiently said that Volkswagen trucks exceed similar Toyota counterparts by 4 km/liter at 5% significance level.
What is the number of degrees of freedom?
0 9
O 21
O 23
O 1
O None of the Choices
Transcribed Image Text:What is the number of degrees of freedom? 0 9 O 21 O 23 O 1 O None of the Choices
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