百度试题 结果1 题目当X与Y的相关系数ρ=时,求Cov(2X,Y).相关知识点: 试题来源: 解析 正确答案: 应用题反馈 收藏
则X表示x轴可能出现的数,Y表示y轴可能出现的。注意这里是关键,给定了4个样本,每个样本都是二维的,所以只可能有X和Y两种维度。所以 用中文来描述,就是: 协方差(i,j)=(第i列的所有元素-第i列的均值)*(第j列的所有元素-第j列的均值) 这里只有X,Y两列,所以得到的协方差矩阵是2x2的矩阵,下面分别求出每...
Briefly, 2xStrep-tagged N protein (mutant and control) was purified as mentioned above. The purified N protein (mutant and control) were cross-linked using 2 mM Bis(sulfosuccinimidyl) suberate (BS3) for 30 min at room temperature. The control and cross-linked forms of N proteins (...
1.Cov(X,Y)=E(XY)-E(X)E(Y)=202-2*10=02。2.协方差的性质：Cov(X，Y)=Cov(Y，X)。3.Cov(aX，bY)=abCov(X，Y)，（a，b是常数）。4.Cov(X1+X2，Y)=Cov(X1，Y)+Cov(X2，Y)。5.由协方差定义，可以看出Cov(X，X)=D(X)，Cov(Y，Y)=D(Y)。6.设X和Y是随机变量，...
Direct-acting antivirals are needed to combat coronavirus disease 2019 (COVID-19), which is caused by severe acute respiratory syndrome-coronavirus-2 (SARS-CoV-2). The papain-like protease (PLpro) domain of Nsp3 from SARS-CoV-2 is essential for viral rep
百度试题 题目【判断题】cov(2X,2Y)=2cov(X,Y) 相关知识点: 试题来源: 解析 错误 反馈 收藏
cov(2y,2x)=E(4xy)-E(2y)E(2x)=4Exy-4ExEy --3 cov(x,3y)=E(3xy)-E(x)E(3y)=3Exy-3ExEy --4 （x^2的意思是 x的二次方 y^2的意思是 y的二次方）由以上四式得 cov(x-2y,2x+3y)=2Dx-（4Exy-4ExEy）+ （3Exy-3ExEy）-6Dy =2Dx-6Dy-(Exy-ExEy)=2Dx-...
2xYT media Sigma-Aldrich Cat# Y2377-250G IPTG RPI Cat# I56000-100.0 Dulbecco’s Modified Eagle Medium (DMEM) Gibco Cat# 11995073 Fetal bovine serum (FBS) Sigma-Aldrich Cat# F4135 Penicillin-Streptomycin Gibco Cat# 15070063 FuGENE HD Transfection Reagent Promega Cat# E2311 Expi293 Expression...
求协方差Cov(2X,3Y)大学概率论我们老师是根据分布律得到XY相互独立,所以根据协方差的计算式Cov(2X,3Y)=6Cov(X,Y);Cov(X,Y)=E(XY)-
(residues 45–181) of human SARS N.b2X-ray diffraction-based crystal structure (PDB ID: 2GIB) of CTD (residues 270–366) of human SARS N. The structure is a homodimer of chains A (violet-red) and B (dark khaki). Residues 270–289 and 362–366 showing disorder propensity are ...