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【单选题】
随机抽取一个样本容量为100的样本,其均值平均值=80,标准差Sn-1=10,所属总体均值u的95%的置信区间为( )A.
[60.40,99.60]
B.
[78.04,81.96]
C.
[76.08,83.92]
D.
[79.80,80.20]
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举一反三
【单选题】--- Did you understand what the teacher said ? ---Yes! She explained the text in detail to make her lessons __________.
A.
easy understood
B.
easily to understand
C.
easily understood
D.
easy understand
【简答题】I Checking Your Comprehension Section A Directions: Read the following statements and mark Y (for Yes) if the statement agrees with the information given in the text; N (for No) if the statement contr...
【简答题】Directions:Read the following statements and mark Y (for Yes)if the statement agrees with the information given in the text;N(for No)if the statement contradicts the information given in the text;NG(f...
【简答题】Directions:Read the following statements and mark Y (for Yes)if the statement agrees with the information given in the text;N(for No)if the statement contradicts the information given in the text;NG(f...
【单选题】___ you ___ the text yet ? Yes, we ___ it two hours ago
A.
Did…copy…did
B.
Have…copied…have
C.
Have…copied…did
D.
Did …copy…had
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