I was hoping someone could help me. I'm doing a project on promotions at work.

I have three variables, scores on a job performance test (continuos variable) , promotion decision (yes or no) and experience of job performance tester (more than five years or less than five years).

In SPSS, I have coded the promotion decision variable as 1 for yes and 2 for no and used a similar coding for the tester experience variable.

My research question is are job performance and promotion decisions related and if they are, is this relationship affected the experience of the job performance tester?

To test the first part of my reaserch question, I'm just going to do a simple bivariate correlation using SPSS. The problem I'm facing is that I dont know how to test the second part of my research question i.e. does tester experience have an effect on the relationship.

Does anybody have any ideas ? I've been told I need to do a regression, but not too familiar with these.

Any help would be greatly appreciated.