A housing community is considering two types of fertilizer for their rose bushes. The community decided to test the fertilizer on 170 bushes to see if one yielded more rose growth than the other. Each rose bush was assigned at random to one of the two fertilizers. The average growth, in centimeters, for each fertilizer was recorded. Fertilizer A is less expensive and will used unless there is convincing evidence that mean growth is greater for Fertilizer B. Make a recommendation as to which fertilizer should be used based on 5% significance level.