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总体分布正态，总体方差[tex=1.0x1.214]+33urkkz3/Nyr4sGrqM3/w==[/tex]已知，从总体中随即抽取容量为[tex=1.0x1.286]0MzHtCQbgnSzLwp5O36txg==[/tex]的小样本。用样本平均数估计总体平均数的置信区间为( )。 未知类型：{'options': ['[tex=16.429x2.429]NGVugV9+AEk3oU1SP4svOEnECjOfa5wuRy6CQxazRYM8WvGhMu6P3tNQq0vKDq/A+H/Y8/zVjc0Qct92MEHEUmUKrE5ytOk9/t8irypV98X1SpmMrLAJJ+pf8K1qazHMv0DSt+Pb6ktcS6JbrcmOTA==[/tex]', '[tex=15.714x2.429]ib9fAZyhfZrrKokwAkpDXYuYcqmy5Gn0p/aw1U1MndCPxYEnDuyCpdLzmTYjTSUmMg/dWkMzutY7vWFcZGMYtlo471SUiCbcWyvclesXprSivb7B8EGTp9X+7YOWP52O[/tex]', '[tex=13.786x2.429]NGVugV9+AEk3oU1SP4svOEnECjOfa5wuRy6CQxazRYPJLvYcNjmkq0bdBXh2UUDCEnk9jDB0qv20HZFfUsm8qFKy9OTTvy8a6QxNhHRe87juVT2evJbrUhN6Yll8iCbN[/tex]', '[tex=13.214x2.429]FAiqofCwiUaPO7pG6z2KugJY0bbWs0yI9/LWkSmka/2QnZ/WKrL3hlP+re5XNVEfGD7TmD020d9OsaBz7Q7aPDneV0JeG3a+r/Zuoh9rOcnoAyvKnTaVopQZi7lX6xr7[/tex]'], 'type': 102}

总体分布正态，总体方差[tex=1.0x1.214]+33urkkz3/Nyr4sGrqM3/w==[/tex]已知，从总体中随即抽取容量为[tex=1.0x1.286]0MzHtCQbgnSzLwp5O36txg==[/tex]的小样本。用样本平均数估计总体平均数的置信区间为( )。 未知类型：{'options': ['[tex=16.429x2.429]NGVugV9+AEk3oU1SP4svOEnECjOfa5wuRy6CQxazRYM8WvGhMu6P3tNQq0vKDq/A+H/Y8/zVjc0Qct92MEHEUmUKrE5ytOk9/t8irypV98X1SpmMrLAJJ+pf8K1qazHMv0DSt+Pb6ktcS6JbrcmOTA==[/tex]', '[tex=15.714x2.429]ib9fAZyhfZrrKokwAkpDXYuYcqmy5Gn0p/aw1U1MndCPxYEnDuyCpdLzmTYjTSUmMg/dWkMzutY7vWFcZGMYtlo471SUiCbcWyvclesXprSivb7B8EGTp9X+7YOWP52O[/tex]', '[tex=13.786x2.429]NGVugV9+AEk3oU1SP4svOEnECjOfa5wuRy6CQxazRYPJLvYcNjmkq0bdBXh2UUDCEnk9jDB0qv20HZFfUsm8qFKy9OTTvy8a6QxNhHRe87juVT2evJbrUhN6Yll8iCbN[/tex]', '[tex=13.214x2.429]FAiqofCwiUaPO7pG6z2KugJY0bbWs0yI9/LWkSmka/2QnZ/WKrL3hlP+re5XNVEfGD7TmD020d9OsaBz7Q7aPDneV0JeG3a+r/Zuoh9rOcnoAyvKnTaVopQZi7lX6xr7[/tex]'], 'type': 102}

总体分布正态，总体方差[tex=1.0x1.214]+33urkkz3/Nyr4sGrqM3/w==[/tex]已知，从总体中随即抽取容量为[tex=1.0x1.286]0MzHtCQbgnSzLwp5O36txg==[/tex]的小样本。用样本平均数估计总体平均数的置信区间为( )。 未知类型：{'options': ['[tex=16.429x2.429]NGVugV9+AEk3oU1SP4svOEnECjOfa5wuRy6CQxazRYM8WvGhMu6P3tNQq0vKDq/A+H/Y8/zVjc0Qct92MEHEUmUKrE5ytOk9/t8irypV98X1SpmMrLAJJ+pf8K1qazHMv0DSt+Pb6ktcS6JbrcmOTA==[/tex]', '[tex=15.714x2.429]ib9fAZyhfZrrKokwAkpDXYuYcqmy5Gn0p/aw1U1MndCPxYEnDuyCpdLzmTYjTSUmMg/dWkMzutY7vWFcZGMYtlo471SUiCbcWyvclesXprSivb7B8EGTp9X+7YOWP52O[/tex]', '[tex=13.786x2.429]NGVugV9+AEk3oU1SP4svOEnECjOfa5wuRy6CQxazRYPJLvYcNjmkq0bdBXh2UUDCEnk9jDB0qv20HZFfUsm8qFKy9OTTvy8a6QxNhHRe87juVT2evJbrUhN6Yll8iCbN[/tex]', '[tex=13.214x2.429]FAiqofCwiUaPO7pG6z2KugJY0bbWs0yI9/LWkSmka/2QnZ/WKrL3hlP+re5XNVEfGD7TmD020d9OsaBz7Q7aPDneV0JeG3a+r/Zuoh9rOcnoAyvKnTaVopQZi7lX6xr7[/tex]'], 'type': 102}

总体分布正态，总体方差[tex=1.0x1.214]+33urkkz3/Nyr4sGrqM3/w==[/tex]已知，从总体中随即抽取容量为[tex=1.0x1.286]0MzHtCQbgnSzLwp5O36txg==[/tex]的小样本。用样本平均数估计总体平均数的置信区间为( )。 未知类型：{'options': ['[tex=16.429x2.429]NGVugV9+AEk3oU1SP4svOEnECjOfa5wuRy6CQxazRYM8WvGhMu6P3tNQq0vKDq/A+H/Y8/zVjc0Qct92MEHEUmUKrE5ytOk9/t8irypV98X1SpmMrLAJJ+pf8K1qazHMv0DSt+Pb6ktcS6JbrcmOTA==[/tex]', '[tex=15.714x2.429]ib9fAZyhfZrrKokwAkpDXYuYcqmy5Gn0p/aw1U1MndCPxYEnDuyCpdLzmTYjTSUmMg/dWkMzutY7vWFcZGMYtlo471SUiCbcWyvclesXprSivb7B8EGTp9X+7YOWP52O[/tex]', '[tex=13.786x2.429]NGVugV9+AEk3oU1SP4svOEnECjOfa5wuRy6CQxazRYPJLvYcNjmkq0bdBXh2UUDCEnk9jDB0qv20HZFfUsm8qFKy9OTTvy8a6QxNhHRe87juVT2evJbrUhN6Yll8iCbN[/tex]', '[tex=13.214x2.429]FAiqofCwiUaPO7pG6z2KugJY0bbWs0yI9/LWkSmka/2QnZ/WKrL3hlP+re5XNVEfGD7TmD020d9OsaBz7Q7aPDneV0JeG3a+r/Zuoh9rOcnoAyvKnTaVopQZi7lX6xr7[/tex]'], 'type': 102}

【单选题】NO 2 、NO 2 - 、NO 2 + 键角大小关系正确的是 。 A. NO 2 > NO 2 - >NO 2 + B. NO 2 + >NO 2 >NO 2 - C. NO 2 - > NO 2 >NO 2 + D. NO 2 + > NO 2 - >NO 2

求定积分[img=179x43]17da65388c0b1ca.png[/img]； （ ） A: log(2^(1/2) + 1)/2 + 2^(1/2)/2 B: log(2^(1/2) + 1)/2 - 2^(1/2)/2 - 1/2 C: log(2^(1/2) + 1)/2 + 2^(1/2)/2 - 1/2 D: log(2^(1/2) + 1)/2 + 2^(1/2)/2 + 1/2

2 + 2 * (2 * 2 - 2) % 2 / 3

函数z=xsiny在点(1,π/4)处的两个偏导数分别为 A: √2/2,√2/2 B: √2/2,-√2/2 C: -√2/2,-√2/2 D: -√2/2,√2/2

2×2×2×2×2