Question #e1eee
1 Answer
Primarily sample size and whether the standard deviation is known or not.
Explanation:

Ztest is a statistical hypothesis test that follows a normal distribution while Ttest follows a Student’s Tdistribution.

A Ttest is appropriate when you are handling small samples (n < 30) while a Ztest is appropriate when you are handling moderate to large samples (n > 30).

Ttest is more adaptable than Ztest since Ztest will often require certain conditions to be reliable. Additionally, Ttest has many methods that will suit any need.

Ttests are more commonly used than Ztests.

Ztests are preferred than Ttests when standard deviations are known.
Read more: Difference Between Ztest and Ttest  Difference Between http://www.differencebetween.net/miscellaneous/differencebetweenztestandttest/#ixzz4zbDXUQ8F