The difference between the Oneway option t Test and the Response Screening F Ratio, is that the Oneway option assumes Unequal Variances, while the Response Screening uses Pooled variances(assumed equal variances).  If you select the Mans/Anova/Pooled t, you will get the identical results from the Oneway analysis and the Response Screening (F Ratio = t^2)
					
				
			
			
				
	Jim