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【简答题】
某医生随机检测了某地 400 名健康成年男子的血清胆固醇含量,得 =4.0(mmol/L), S=0. 5 (mmol/L) ,试回答下列问题。( 20分) ( 1 )本研究的抽样误差为多少? ( 2 )本资料的变异系数为多少? ( 3 )试估计该地健康成年男子的血清胆固醇含量总体均数的 95%的 置信 区间。 ( 4 )试估计该地健康成年男子的血清胆固醇含量 95%的正常值范围。
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recognize
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【单选题】当复选框设置为图片风格时,下列_________属性可以在复选框被选中时显示图形。
A.
DisabledPicture
B.
DownPicture
C.
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D.
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【单选题】当复选框设置为图片风格时,下列_________属性可以在复选框被选中时显示图形。
A.
DisabledPicture
B.
DownPicture
C.
Picture
D.
Image
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