Q1: A transportcompany wants to compare the fuel efficiencies of the two types oflorry it operates. It obtains data from samples of the two types oflorry, with the following results:
Type | Average mpg | Std devn | Sample size |
A | 30.1 | 7.6 | 13 |
B | 33.2 | 5.8 | 17 |
At 90% confidence level, test the hypothesis that lorries oftype B are more efficient than type A. Use critical valueapproach and assume unequal variation in mpg of twotypes.
