How to know to use t test or z test

- How to use t test and z test
- How to know when to use t test vs z test
- How to know if i should use t test or z test
- How to know t test or z test
- How do you know when to use t test or z test
- How to know if t test or z test
- How to know when to do t test or z test
- How to know whether to do t test or z test
- How to know t test vs z test
- T test and z test
- T test and z test in hypothesis testing