The Mid-Distance Running Coach,Zdravko Popovich,for the Olympic Team of an Eastern

The mid-distance running coach,Zdravko Popovich,for the Olympic team of an eastern European country claims that his six-month training program significantly reduces the average time to complete a 1500-meter run.Five mid-distance runners were randomly selected before they were trained with coach Popovich's six-month training program,and their completion times (in minutes)of the 1500-meter run were recorded.After six months of training under coach Popovich,the same five runners' 1500-meter run times were recorded again.The results are given below.