NO.PZ2021071601000005
问题如下：
A test based on the Spearman rank
correlation coefficient is used when:
选项：
A.when the population under consideration meaningfully departs from normality B.when the population is with a normal distributionC.only when the sample size is larger than 30.
解释：
A is correct.
If the population under consideration meaningfully departs from normality, we can use a test based on the Spearman rank correlation coefficient, rs .
我看着像还是在normal 下的分布 所以选了c。我印象中这个知识点是，不符合正态分布，如果小样本可以用斯皮尔曼，大样本用那个参数检验的t分布公式。
