已知总体标准差,但样本含量不大,总体均数95%的可信区间用
A <img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230804/12259723_0.gif">-t0.025(V)S<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230804/12259723_0_1.gif">,<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230804/12259723_0_2.gif">+t0.025(V)S<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230804/12259723_0_3.gif"> B
<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230804/12259723_0_4.gif">-1.96S<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230804/12259723_0_5.gif">,<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230804/12259723_0_6.gif">+1.96S<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230804/12259723_0_7.gif"> C
<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230804/12259723_0_8.gif">-1.96σ<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230804/12259723_0_9.gif">,<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230804/12259723_0_10.gif">+1,96σ<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230804/12259723_0_11.gif"> D
<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230804/12259723_0_12.gif">-1.645S<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230804/12259723_0_13.gif">,<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230804/12259723_0_14.gif">+1.645S<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230804/12259723_0_15.gif"> E
<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230804/12259723_0_16.gif">-2.58S<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230804/12259723_0_17.gif">,<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230804/12259723_0_18.gif">+2.58S<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230804/12259723_0_19.gif">