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【简答题】
设函数F(x)=max{f 1 (x)，f 2 (x)}的定义域为(-1，1)，其中f 1 (x)=x+1，f 2 (x)=(x+1) 2 ，试讨论F(x)在x=0处的连续性与可导性
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【简答题】正常男子血小板计数均值为 225 x 10^9/ L ,今测得 20 名男性油漆作业工人的血小板计数值( 10^9/L ) 220 188 162 230 145 160 238 188 247 113 126 245 1 231 256 183 190 158 224 175 问油漆工人的血小板计数与正常成年男子有无差异 ?
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【单选题】正常男子血小板计数均值为225 × 10^9/L, 今测得20 名男性油漆作业工人的血小板计数值（单位： 10^9/L ）220 188 162 230 145 160 238 188 247 113 126 245 164 231 256 183 190 158 224 175问油漆工人的血小板计数与正常成年男子有无差异？假设检验的方法，命令如下：x<-c(220 ,188, 162, 230,...
A.
test(x,mu=225)
B.
t.test(x,mu=10)
C.
t.test(x,mu=225)
D.
t.test(x)
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