16 0.67 points -DO During our experimental study to prevent school suspensions among students on probation in Palm Beach County, the superintendent announced an initiative to reduce school suspensions overall. That is, an outside event that also influenced suspensions coincidentally occurred during our study. This means that is a problem for our study. Testing Experimental mortality History Instrumentation 17 0.66 points D- The placebo effect is when: Neither subjects nor experimenters know who is receiving the independent variable Researchers' expectations influence experimental outcomes Control subjects respond positively to a mock independent variable Raters follow their initial tendencies when making repeated ratings of subjects