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Stats Notes: Process flow for Z-test, T-test?

Question: What's the systematic approach to compare two means, two proportions?
When do we need to apply Z-test? and when to apply T-test? What are the assumptions for each test?

Answer: As you can see from the following process flow, the first step is to check if those two samples are independent or not, in other words, it is paired or not?
If it's paired, then we need to use paired t-test. Otherwise, we check if we have enough sample size, the rule of thumb is to be greater or equal than 30. ... ...

T test, Z test, compare two means tutorial

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