Question

Delta Airlines is trying to determine if pilots are deliberately slowing down during a labor dispute. They know that their all their flights have a mean late time of 12.8 minutes with a standard deviation of 6.8 minutes. They took a random sample of 31 flights during the dispute and found they were 15.1 minutes late on average. Using a significance level of 0.05, is there any evidence to back the pilots claim that they are not slowing down?

Answer 1

ciotto: "512.8 versus Hail> 12.8 (1) a= 0.05 levd of siquiti Cance. ? The test statistic t -W (15 112.8) z = 1-88 (1) pevalue = 10.0301 (v) claim: Reject to thereis sufficient evide reject the piloto claim that they are not showing late