Contract negotiations between a labor union and management can be contentious and long affairs. The length of negotiations depends upon the labor/management relationship, contract issues, and economic conditions. Suppose independent random samples of contract negotiations involving airline carriers were obtained, and the duration of each (in months) was recorded. The summary statistics are given in the following table.
Assume that the underlying distributions are normal and the population variances are unequal.
(a) Find a 95% confidence interval for the difference in the mean durations of negotiations for these two airlines.
(b) Is there any evidence to suggest that the mean duration of negotiations for these two airlines is different? Use α = 0.05
a) The confidence interval for the mean difference is given by CI =(x̄ 1 -x̄ 2 ) + t *sqrt( Sp 2 (1/n 1 +1/n 2... View the full answer