lyw · 2024年01月04日
NO.PZ2022123001000122
问题如下：
An analyst collects the following data related to paired observations for Sample A and Sample B. Assume that both samples are drawn from normally distributed populations and that the population variances are not known.
The t-statistic to test the hypothesis that the mean difference is equal to zero is closest to:
选项：
A.
0.23
B.
0.27
C.
0.52
解释：
你好 本题第二步骤的标准差在计算器上如何按的
为什么2nd7按完这几个数字，然后接着按2nd8出不来答案这个标准差和均值？
NO.PZ2022123001000122 问题如下 analyst collects the following ta relatetopaireobservations for Sample A anSample Assume thboth samples areawn from normally stributepopulations anththe population variancesare not known.The t-statistic to test the hypothesis ththe mefferenis equto zero is closest to: A.0.23 B.0.27 C.0.52 2n8得到均值 1.4， 和样本标准差 6.0663这里用计算器会按，但是没明白为什么要用Sx 而不是σx？
NO.PZ2022123001000122 问题如下 analyst collects the following ta relatetopaireobservations for Sample A anSample Assume thboth samples areawn from normally stributepopulations anththe population variancesare not known.The t-statistic to test the hypothesis ththe mefferenis equto zero is closest to: A.0.23 B.0.27 C.0.52 看题目是满足这些条件的，为啥不是用这个公式啊？为啥答案是除以根号5而不是除以（s/根号5）？
NO.PZ2022123001000122 问题如下 analyst collects the following ta relatetopaireobservations for Sample A anSample Assume thboth samples areawn from normally stributepopulations anththe population variancesare not known.The t-statistic to test the hypothesis ththe mefferenis equto zero is closest to: A.0.23 B.0.27 C.0.52 这道题可以用计算器按吗？
NO.PZ2022123001000122 问题如下 analyst collects the following ta relatetopaireobservations for Sample A anSample Assume thboth samples areawn from normally stributepopulations anththe population variancesare not known.The t-statistic to test the hypothesis ththe mefferenis equto zero is closest to: A.0.23 B.0.27 C.0.52
