public boolean setInterArrivalTimeParameters(int jobType, 
    		double aarr, double barr, double anum, double bnum,	double arar) {
    	if(jobType > BATCH_JOBS || jobType < INTERACTIVE_JOBS) {
    		return false;
    	}
    	
    	if(useJobType_) {
	    	this.aarr[jobType] = aarr * arar;  
	    	this.barr[jobType] = barr;
	    	this.anum[jobType] = anum;  
	    	this.bnum[jobType] = bnum;
    	}
    	else {
	    	this.aarr[INTERACTIVE_JOBS] = this.aarr[BATCH_JOBS] = aarr * arar;  
	    	this.barr[INTERACTIVE_JOBS] = this.barr[BATCH_JOBS] = barr;
	    	this.anum[INTERACTIVE_JOBS] = this.barr[BATCH_JOBS] = anum;  
	    	this.bnum[INTERACTIVE_JOBS] = this.barr[BATCH_JOBS] = bnum;
    	}

        return true;
    }