Nacirema Airlines is buying a fleet of new fuel-efficient planes.The HogJet and the LitheJet both meet their price and performance needs,and both planes meet EPA noise guidelines.However,the quieter plane is preferred.Each plane is flown through a typical takeoff and landing sequence 10 times,while remote sensors at ground level record the noise levels (in decibels).The table below summarizes the sound level tests using Excel's default level of significance ($\alpha$ = 0.05). In a left-tailed test comparing the means at $\alpha$ = .05,we would: A) not reject H₀. B) reject H₀. C) have insufficient information to make a decision.

Question

Quizplus · Accepted Answer

Based on the given information, a left-tailed test is appropriate as the quieter plane is preferred. The null hypothesis (H₀) is that there is no significant difference in the noise levels between the two planes. Using a significance level of .05, we compare the p-value to the level of significance. The calculated p-value is less than .05, which indicates that we reject the null hypothesis and conclude that there is a significant difference in noise levels between the two planes. Therefore, the preferred choice is to reject H₀.

Nacirema Airlines Is Buying a Fleet of New Fuel-Efficient Planes α\alphaα

Nacirema Airlines Is Buying a Fleet of New Fuel-Efficient Planes $\alpha$