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we are growing two rows of cucumber plants. the first row is t reated with extra nitrogen in the soil. the second row is the control. the first row contai ns 17 plants and produces an average of 5.4 cucumbers per plant with a sample deviation of 1.3 cucumbers. the second row has 28 plants with an average of 5.1 cucumbers prod uced and a sample deviation of 2 cucumbers. is it reasonable (95% confidence) t o say that the nitrogen made a difference?