【名词&注释】
指导思想(guiding ideology)、正相关(positive correlation)、实事求是(seeking truth from facts)、负相关(negative correlation)、工作制度(working system)、自变量(independent variable)、精益求精(keep improving)、因变量(dependent variable)、必不可少(absolutely necessary)、不相关(uncorrelated)
[单选题]当自变量X与因变量(dependent variable)Y之间的相关程度r为正时,说明()
A. X与Y正相关
B. X与Y负相关
C. X与Y不相关(uncorrelated)
D. X与Y完全相关