【单选题】测了 15 名大学生运动员训练前后每人的纵跳成绩如表 30 ,问训练前后纵跳成绩的差异有无意义?( a=0.05 ) 序号 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 训练前 51 62 68 61 50 55 64 59 60 60 60 55 59 63 64 训练后 64 69 70 63 58 71 64 68 62 67 70 59 61 70 65
A.
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
【单选题】—'Where is your mother?' —'_____' [ ]
A.
She works in a factory.
B.
She is in the kitchen, she's cleaning.
C.
She is a teacher in No.1 Middle School.
D.
She 1ikes watching TV .
【简答题】若 tan( π 4 +α)=2 ,则tan2α=______.
【单选题】I _____ my pen at home. Can I use your pen, please? [ ]
【单选题】I had long coveted Polly Espy.
【单选题】I had long coveted Polly Espy.
【单选题】如果在数据库中已有同名的表,要通过查询覆盖原来的表,应该使用的查询类型是( )。