Two groups of 10 soybean plants are measured for height in meters. group a receives an experimental fertilizer while group b receives the normal fertilizer treatment. group a: 1.4, 1.3, 1.5, 1.5, 1.7, 1.3, 1.4, 1.3, 1.5, 1.4 group b 1.2, 1.3, 1.0, 1.2, 1.3, 1.4, 1.4, 1.2, 1.3, 1.3 find the mean of group a and b and the mean difference. group a mean: group b mean: difference of means: the groups are re- randomized and the mean differences are represented in the dot plot. is the mean difference between the experimental and normal fertilizer significant?