Which Test test statistic should be used?
Which test statistic should be used if you have
1. large sample size with unknown variance.
2. small sample size with known variance
1 answers ( 0 marked as helpful)
Hey Sylvester :
When the sample size >30, z statistic should be used.
When the sample size <30, t statistic should be used, regardless of whether the population variance is known or not
