若相关系数r＜0，说明现象之间存在（）。

两变量只有存在较密切的相关关系时，才能建立有意义的（）。

几何平均法与高次方程法计算平均发展速它们两者的区别是什么？

统计学是一门研究现象总体（）方面的方法论科学。

标志是说明（）特征的名称，它分为（）标志和（）标志。

如果时间数列的（）大体相同，可拟合直线议程，如果（）大体相同，可拟合指数议程。

同一总体内的部分数值与总体数值之比称为（）指标；同类指标在不同时间之间的比值则称为（）指标。

A system administrator has set up a Virtual IO Server to manage three micropartitioned LPARs. Physical disks are attached to the Virtual IO Server which is accessed through Multipath IO. What should the administrator know about monitoring for error conditions with virtual disks?（）

A. Both permanent and temporary virtual hardware error messages are logged to each client partition sharing the device.
Both permanent and temporary error messages for virtual hardware are logged at each occurrence on the Virtual IO Server and then propagated to the client partition.
C. Temporary error messages for virtual hardware are logged at each occurrence on the Virtual IO Server. Permanent error messages for virtual hardware are stored on the client partition.
D. Temporary error messages for virtual hardware will not necessarily be propagated to the client partition. Permanent error messages for virtual hardware are only logged once on the Virtual IO Server.

一口袋装有3只红球，2只黑球，今从中任意取出2只球，那么这2只球恰有一红一黑的概率是3/5

A. 正确
B. 错误

当相关系数r等于（）时，X与Y之间为完全正相关，当r等于（）时，X与Y之间为完全负相关。