An operations research analysthas developed a simulation model of a busy intersection. She wants to evaluate two different traffic light patterns. The goalis tofind which pattern creates the shortest average wait time per automobile. The modelis set up to evaluate the two patterns using common random numbersso that each system will see identical traffic patterns. What type of hypothesis testing model below should she use to perform her analysis?

-Independent sample- unknown equal variance

-Independent sample-unknown unequal variance

-Dependent sample

-independent sample- known variable