已知一般健康男子心率总体均数为72次/分,现抽样调查某山区25名健康男子的心率均数为74.8次/分,标准差为6.5次/分,作该山区与一般健康男子的心率均数的假设
A <img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230104/12477785_0.gif"> B
<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230104/12477785_0_1.gif"> C
<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230104/12477785_0_2.gif"> D
<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230104/12477785_0_3.gif"> E
<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230104/12477785_0_4.gif">