请教老师mock83-31
which is least likely to increase the reliability of parameter estimates?
A. increase the sample size
B. use of point estimates rather than confidence intervals
C. use of t-distribution rather than normal distribution to establish confidence
答案选B,关于C选项,是不是t分布相比较正态分布而言,分布分散,所以估计没有正态分布准确,那么C也应该选是吗?请老师解答,谢谢! |