用两种方法测定鱼肉中的Ca含量( (ppm),测得数据如下:-|||-方法一:0.44,0.45,0.47,0.48,0.43;-|||-方法二:0.39,0.40,0.39,0.44,0.42,0.45。-|||-问:这两种方法是否存在显著性差异?( =90% )-|||-ta,f值表如下:-|||-f 9 10 11-|||-=90% 1.83 1.81 1.80-|||-F值表(置信度95 %)如下:-|||-f大 4 5 6-|||-f小-|||-4 6.39 6.26 6.16-|||-5 5.19 5.05 4.95-|||-6 4.53 4.39 4.28