I have an assignment, where I'm supposed to measure whether an intervention at a border crossing point will an effect on the traffic flow.
We have a total of 7 border crossing points and we continously measure the traffic flow (n vehicles pr. hour).
Intervention period will be 3 weeks at one border crossing point.
My initial thought was to basically compare means (t-test) between intervention period (3 wks) vs non-intervention period (3 wks up to intervention). The problem is however that traffic flow is stochastic, hence flow changes could easily be contributed natural variation. Is it possible to some how adjust for these natural variations using the remaining 6 border crossing points?