Homework Soursein what situation it is apporiate to use ztest instead of a
in what situation it is apporiate to use ztest instead of a ttest when testing for the difference in the means of two independent samples
in what situation it is apporiate to use ztest instead of a ttest when testing for the difference in the means of two independent samples
in what situation it is apporiate to use ztest instead of a ttest when testing for the difference in the means of two independent samples
Solution
We use z instead of t test if both standard deviations are known, or if sample sizes for both groups are very large, so that population standard deviations can be well approximated by sample ones.
