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【简答题】
假设某研究者基于100个班的班级规模（CS）和平均测试成绩（TestScore）数据估计的OLS回归为：【图片】这100个班的测试成绩的样本标准差(【图片】)等于（ ）(答案保留小数点后两位)
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举一反三
【单选题】Why is the world stuck on Elvis Presley?
A.
He had innate talent for music.
B.
He was the richest singer in America.
C.
He symbolizes the American dream.
D.
He stands for the new generation.
【单选题】He had a talent for music and was______conductor of Shanghai Symphony Orchestra at the age of 30.
A.
assigned
B.
appointed
C.
named
D.
honored
【单选题】He discovered that he had a talent laying titles and began to take it.
A.
o;up
B.
for; on
C.
for;out
D.
of;on
【单选题】()是指平均大潮低潮线至平均大潮高潮线之间的地带。此带周期性地受海水的淹没和出露,侵蚀、淤积变化复杂,滩面上有水流冲刷成的潮沟和浪蚀的坑洼,是发展海水养殖业的重要场所。
A.
潮上带
B.
潮间带
C.
潮下带
D.
海岸带
【简答题】______(他别无选择只好换专业)since he discovered that he had little talent for programming．
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