Example

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. Assume

the population standard deviations are different. The summary

statistics are given below. Is there any evidence to suggest that the

mean duration of negotiations for these two airlines is different? Use

$=0\mathrm{.}02$