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【单选题】
两种教材分别在两个小组实验, n1=12 , n2=9 ,实验后进行测验,结果如表 2 ,两种教材效果差异是否显著?( a=0.05 ) 1 2 3 4 5 6 7 8 9 10 11 12 68 78 89 90 88 85 86 91 96 86 87 92 70 58 69 65 66 68 77 72 76A.
独立样本T检验 (1) (2)公式 （3）nˊ=n1+n2-2
B.
单个样本T检验 (1) (2)公式 （3）nˊ=n-1
C.
卡方检验 (1) (2)公式 （3）nˊ=（行-1）*（列-1）
D.
配对T检验 (1) (2)公式 （3）nˊ=n-1
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A.
much closer than that between real interest rates and exchange rate movements.
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A.
位于椎管内壁与硬脊膜之间
B.
内有脂肪、椎内静脉丛、淋巴管、脊神经等
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总容量约为100ml