The following data give the recovery of bromide from spiked samples of vegetable matter, measured using a gas-liquid chromatographic method. The same amount of bromide was added to each specimen. 790 770 764 ug ml-1 782 g ml-1 Tomato: 777 790 759 758 Cucumber: 782 773 778 765 789 797 Test whether the recoveries from the two vegetables have variances which differ significantly. Test whether the mean recovery rates differ significantly.