of The mean of the number of revolutions pes minute of two competing enginers are to be compared, Thirty engines are randomly assigned to the tested. Both population have normal distributions. Do the dato indicate that Engines 2 har higher RPM than Engine 1. Pert at a 5 0 level of significance. Engine sample Mean standa drew 1850 5 35 2 1 165 0 65 use the data given in the above table and find the interval estimation at toyo level of signfor