=31.645,样本方差s2=0.O9,则总体均值μ的置信度为0.98的置信区间为()。
A.(30.88,32.63) B.(31.45,31.84) C.(31.62,31.97) D.(30.45,31.74)正确答案B
=31.645,样本方差s2=0.O9,则总体均值μ的置信度为0.98的置信区间为()。
=31.645,样本方差s2=0.O9,则总体均值μ的置信度为0.98的置信区间为()。
A.(30.88,32.63) B.(31.45,31.84) C.(31.62,31.97) D.(30.45,31.74)正确答案B