Bebi has several trees that are bearing fruit. For not wanting the fruit to be attacked insects, Bebi uses a spray that is claimed to keep insects away from the fruit. Of the total 27 trees owned, 12 trees were sprayed with spray and the rest were left alone. The yields for the trees in Bebi's garden are as follows: Sprayed Not Sprayed Mean 24.9 23,3 Standard Deviation 1,9 4,5 If it is assumed that the variances are unequal, how can the spray increase the total fruit harvested from the tree