A teacher gives a third grade class of n=16 a vocabulary test at the beginning of the school year.To evaluate the changes that occur during the year, students are tested again at the end o the year.Their test scores reveled an average improvement of MD=5.7 points with s(平方)=144. Does this constitute a significant improvment? Use a one-tailed an alpha level of .05. 以上是题目 拜托各位帮我解答一下疑问 感激 -- 夫兵者不祥之器物或恶之故有道者不处君子居则贵左用兵则贵右兵者不祥之器非君子 之器不得已而用之恬淡为上胜而不美而美之者是乐杀人夫乐杀人者则不可得志於天下 矣吉事尚左凶事尚右偏将军居左上将军居右言以丧礼处之杀人之众以哀悲泣之战胜以 丧礼处之道常无名朴虽小天下莫能臣侯王若能守之万物将自宾天地相合以降甘露民莫 之令而自均始制有名名亦既有夫亦将知止知 220-141-138-139.dynamic.hinet.net海